Fix google-explicit-constructor warnings in gui and ui.

* Add explicit keyword to conversion constructors.
Bug: 28341362
Test: build with WITH_TIDY=1

Change-Id: I476ad1e9a4d47acb11bf4a87ad8baa855f441417
diff --git a/include/gui/BufferQueue.h b/include/gui/BufferQueue.h
index 09300a2..a23ed57 100644
--- a/include/gui/BufferQueue.h
+++ b/include/gui/BufferQueue.h
@@ -60,7 +60,7 @@
     // weak references.
     class ProxyConsumerListener : public BnConsumerListener {
     public:
-        ProxyConsumerListener(const wp<ConsumerListener>& consumerListener);
+        explicit ProxyConsumerListener(const wp<ConsumerListener>& consumerListener);
         virtual ~ProxyConsumerListener();
         virtual void onFrameAvailable(const BufferItem& item) override;
         virtual void onFrameReplaced(const BufferItem& item) override;
diff --git a/include/gui/ConsumerBase.h b/include/gui/ConsumerBase.h
index 9307a26..c62e733 100644
--- a/include/gui/ConsumerBase.h
+++ b/include/gui/ConsumerBase.h
@@ -94,7 +94,7 @@
     // buffers from the given IGraphicBufferConsumer.
     // The controlledByApp flag indicates that this consumer is under the application's
     // control.
-    ConsumerBase(const sp<IGraphicBufferConsumer>& consumer, bool controlledByApp = false);
+    explicit ConsumerBase(const sp<IGraphicBufferConsumer>& consumer, bool controlledByApp = false);
 
     // onLastStrongRef gets called by RefBase just before the dtor of the most
     // derived class.  It is used to clean up the buffers so that ConsumerBase
diff --git a/include/gui/IGraphicBufferProducer.h b/include/gui/IGraphicBufferProducer.h
index 37ae6df..df2b781 100644
--- a/include/gui/IGraphicBufferProducer.h
+++ b/include/gui/IGraphicBufferProducer.h
@@ -292,7 +292,7 @@
 
     struct QueueBufferInput : public Flattenable<QueueBufferInput> {
         friend class Flattenable<QueueBufferInput>;
-        inline QueueBufferInput(const Parcel& parcel);
+        explicit inline QueueBufferInput(const Parcel& parcel);
         // timestamp - a monotonically increasing value in nanoseconds
         // isAutoTimestamp - if the timestamp was synthesized at queue time
         // dataSpace - description of the contents, interpretation depends on format
diff --git a/include/gui/Surface.h b/include/gui/Surface.h
index 646203b..592391f 100644
--- a/include/gui/Surface.h
+++ b/include/gui/Surface.h
@@ -66,7 +66,7 @@
      * the controlledByApp flag indicates that this Surface (producer) is
      * controlled by the application. This flag is used at connect time.
      */
-    Surface(const sp<IGraphicBufferProducer>& bufferProducer, bool controlledByApp = false);
+    explicit Surface(const sp<IGraphicBufferProducer>& bufferProducer, bool controlledByApp = false);
 
     /* getIGraphicBufferProducer() returns the IGraphicBufferProducer this
      * Surface was created with. Usually it's an error to use the
diff --git a/include/ui/Fence.h b/include/ui/Fence.h
index b431bd5..a4c1df7 100644
--- a/include/ui/Fence.h
+++ b/include/ui/Fence.h
@@ -53,7 +53,7 @@
     // Construct a new Fence object to manage a given fence file descriptor.
     // When the new Fence object is destructed the file descriptor will be
     // closed.
-    Fence(int fenceFd);
+    explicit Fence(int fenceFd);
 
     // Check whether the Fence has an open fence file descriptor. Most Fence
     // methods treat an invalid file descriptor just like a valid fence that