Add optimization to TextureLayer

cc/layers/texture_layer_unittest.cc

Index: cc/layers/texture_layer_unittest.cc
diff --git a/cc/layers/texture_layer_unittest.cc b/cc/layers/texture_layer_unittest.cc
index c6a45499c88116f16e44442fa319f27cfe55aad8..55b4c738d22656ee99fdf9731f1040d14bd59391 100644
--- a/cc/layers/texture_layer_unittest.cc
+++ b/cc/layers/texture_layer_unittest.cc
@@ -13,6 +13,7 @@
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/test/layer_test_common.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
@@ -181,6 +182,24 @@ TEST_F(TextureLayerTest, SyncImplWhenRemovingFromTree) {
   Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 }
 
+TEST_F(TextureLayerTest, CheckPropertyChangeCausesCorrectBehavior) {
+  scoped_refptr<TextureLayer> test_layer = TextureLayer::Create(NULL);
+  test_layer->SetLayerTreeHost(layer_tree_host_.get());
+
+  // Test properties that should call SetNeedsCommit.  All properties need to
+  // be set to new values in order for SetNeedsCommit to be called.
+  EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetFlipped(false));
+  EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetUV(
+      gfx::PointF(0.25f, 0.25f), gfx::PointF(0.75f, 0.75f)));
+  EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetVertexOpacity(
+      0.5f, 0.5f, 0.5f, 0.5f));
+  EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetPremultipliedAlpha(false));
+  EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetTextureId(1));
+
+  // Calling SetTextureId can call AcquireLayerTextures.
+  EXPECT_CALL(*layer_tree_host_, AcquireLayerTextures()).Times(AnyNumber());
+}
+
 class MockMailboxCallback {
  public:
   MOCK_METHOD3(Release, void(const std::string& mailbox,