Tessellate on worker threads

Tessellate and cache (where possible) shadow and round rect
tessellation tasks.

Change-Id: I2cfda8e11d83d51ea74af871235cf26e8f831d40
diff --git a/libs/hwui/StatefulBaseRenderer.cpp b/libs/hwui/StatefulBaseRenderer.cpp
index 90039e9..f2e28e1 100644
--- a/libs/hwui/StatefulBaseRenderer.cpp
+++ b/libs/hwui/StatefulBaseRenderer.cpp
@@ -101,6 +101,10 @@
 // Matrix
 ///////////////////////////////////////////////////////////////////////////////
 
+void StatefulBaseRenderer::getMatrix(Matrix4* matrix) const {
+    matrix->load(*(mSnapshot->transform));
+}
+
 void StatefulBaseRenderer::getMatrix(SkMatrix* matrix) const {
     mSnapshot->transform->copyTo(*matrix);
 }