diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index bfc6f28..b5295f2 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -136,5 +136,101 @@
     return NO_ERROR;
 }
 
+void DisplayState::merge(const DisplayState& other) {
+    if (other.what & eSurfaceChanged) {
+        what |= eSurfaceChanged;
+        surface = other.surface;
+    }
+    if (other.what & eLayerStackChanged) {
+        what |= eLayerStackChanged;
+        layerStack = other.layerStack;
+    }
+    if (other.what & eDisplayProjectionChanged) {
+        what |= eDisplayProjectionChanged;
+        orientation = other.orientation;
+        viewport = other.viewport;
+        frame = other.frame;
+    }
+    if (other.what & eDisplaySizeChanged) {
+        what |= eDisplaySizeChanged;
+        width = other.width;
+        height = other.height;
+    }
+}
+
+void layer_state_t::merge(const layer_state_t& other) {
+    if (other.what & ePositionChanged) {
+        what |= ePositionChanged;
+        x = other.x;
+        y = other.y;
+    }
+    if (other.what & eLayerChanged) {
+        what |= eLayerChanged;
+        z = other.z;
+    }
+    if (other.what & eSizeChanged) {
+        what |= eSizeChanged;
+        w = other.w;
+        h = other.h;
+    }
+    if (other.what & eAlphaChanged) {
+        what |= eAlphaChanged;
+        alpha = other.alpha;
+    }
+    if (other.what & eMatrixChanged) {
+        what |= eMatrixChanged;
+        matrix = other.matrix;
+    }
+    if (other.what & eTransparentRegionChanged) {
+        what |= eTransparentRegionChanged;
+        transparentRegion = other.transparentRegion;
+    }
+    if (other.what & eFlagsChanged) {
+        what |= eFlagsChanged;
+        flags = other.flags;
+        mask = other.mask;
+    }
+    if (other.what & eLayerStackChanged) {
+        what |= eLayerStackChanged;
+        layerStack = other.layerStack;
+    }
+    if (other.what & eCropChanged) {
+        what |= eCropChanged;
+        crop = other.crop;
+    }
+    if (other.what & eDeferTransaction) {
+        what |= eDeferTransaction;
+        barrierHandle = other.barrierHandle;
+        barrierGbp = other.barrierGbp;
+        frameNumber = other.frameNumber;
+    }
+    if (other.what & eFinalCropChanged) {
+        what |= eFinalCropChanged;
+        finalCrop = other.finalCrop;
+    }
+    if (other.what & eOverrideScalingModeChanged) {
+        what |= eOverrideScalingModeChanged;
+        overrideScalingMode = other.overrideScalingMode;
+    }
+    if (other.what & eGeometryAppliesWithResize) {
+        what |= eGeometryAppliesWithResize;
+    }
+    if (other.what & eReparentChildren) {
+        what |= eReparentChildren;
+        reparentHandle = other.reparentHandle;
+    }
+    if (other.what & eDetachChildren) {
+        what |= eDetachChildren;
+    }
+    if (other.what & eRelativeLayerChanged) {
+        what |= eRelativeLayerChanged;
+        z = other.z;
+        relativeLayerHandle = other.relativeLayerHandle;
+    }
+    if (other.what & eReparent) {
+        what |= eReparent;
+        parentHandleForChild = other.parentHandleForChild;
+    }
+}
 
 }; // namespace android
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 15c4c9a..2adc273 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -104,6 +104,30 @@
     mComposerStates = other.mComposerStates;
 }
 
+SurfaceComposerClient::Transaction& SurfaceComposerClient::Transaction::merge(Transaction&& other) {
+    for (auto const& state : other.mComposerStates) {
+        ssize_t index = mComposerStates.indexOf(state);
+        if (index < 0) {
+            mComposerStates.add(state);
+        } else {
+            mComposerStates.editItemAt(static_cast<size_t>(index)).state.merge(state.state);
+        }
+    }
+    other.mComposerStates.clear();
+
+    for (auto const& state : other.mDisplayStates) {
+        ssize_t index = mDisplayStates.indexOf(state);
+        if (index < 0) {
+            mDisplayStates.add(state);
+        } else {
+            mDisplayStates.editItemAt(static_cast<size_t>(index)).merge(state);
+        }
+    }
+    other.mDisplayStates.clear();
+
+    return *this;
+}
+
 status_t SurfaceComposerClient::Transaction::apply(bool synchronous) {
     if (mStatus != NO_ERROR) {
         return mStatus;
diff --git a/libs/gui/include/gui/LayerState.h b/libs/gui/include/gui/LayerState.h
index ae6965a..f3fb82f 100644
--- a/libs/gui/include/gui/LayerState.h
+++ b/libs/gui/include/gui/LayerState.h
@@ -77,6 +77,7 @@
         matrix.dsdy = matrix.dtdx = 0.0f;
     }
 
+    void merge(const layer_state_t& other);
     status_t    write(Parcel& output) const;
     status_t    read(const Parcel& input);
 
@@ -144,6 +145,7 @@
     };
 
     DisplayState();
+    void merge(const DisplayState& other);
 
     uint32_t what;
     sp<IBinder> token;
diff --git a/libs/gui/include/gui/SurfaceComposerClient.h b/libs/gui/include/gui/SurfaceComposerClient.h
index d63dafe..87fdfae 100644
--- a/libs/gui/include/gui/SurfaceComposerClient.h
+++ b/libs/gui/include/gui/SurfaceComposerClient.h
@@ -144,7 +144,9 @@
         Transaction(Transaction const& other);
 
         status_t apply(bool synchronous = false);
-
+        // Merge another transaction in to this one, clearing other
+        // as if it had been applied.
+        Transaction& merge(Transaction&& other);
         Transaction& show(const sp<SurfaceControl>& sc);
         Transaction& hide(const sp<SurfaceControl>& sc);
         Transaction& setPosition(const sp<SurfaceControl>& sc,
@@ -175,8 +177,6 @@
                 float alpha);
         Transaction& setMatrix(const sp<SurfaceControl>& sc,
                 float dsdx, float dtdx, float dtdy, float dsdy);
-        Transaction& setOrientation(const sp<SurfaceControl>& sc,
-                const Rect& crop);
         Transaction& setCrop(const sp<SurfaceControl>& sc, const Rect& crop);
         Transaction& setFinalCrop(const sp<SurfaceControl>& sc, const Rect& crop);
         Transaction& setLayerStack(const sp<SurfaceControl>& sc, uint32_t layerStack);
diff --git a/services/surfaceflinger/tests/Transaction_test.cpp b/services/surfaceflinger/tests/Transaction_test.cpp
index ec87eee..16a16a5 100644
--- a/services/surfaceflinger/tests/Transaction_test.cpp
+++ b/services/surfaceflinger/tests/Transaction_test.cpp
@@ -891,6 +891,30 @@
     }
 }
 
+TEST_F(LayerUpdateTest, MergingTransactions) {
+    sp<ScreenCapture> sc;
+    {
+        SCOPED_TRACE("before move");
+        ScreenCapture::captureScreen(&sc);
+        sc->expectBGColor(0, 12);
+        sc->expectFGColor(75, 75);
+        sc->expectBGColor(145, 145);
+    }
+
+    Transaction t1, t2;
+    t1.setPosition(mFGSurfaceControl, 128, 128);
+    t2.setPosition(mFGSurfaceControl, 0, 0);
+    // We expect that the position update from t2 now
+    // overwrites the position update from t1.
+    t1.merge(std::move(t2));
+    t1.apply();
+
+    {
+        ScreenCapture::captureScreen(&sc);
+        sc->expectFGColor(1, 1);
+    }
+}
+
 class ChildLayerTest : public LayerUpdateTest {
 protected:
     void SetUp() override {