Have a common implementation of cc::OutputSurface

cc/layer_tree_host_unittest.cc

Index: cc/layer_tree_host_unittest.cc
diff --git a/cc/layer_tree_host_unittest.cc b/cc/layer_tree_host_unittest.cc
index 896d5f57b4fdcaa1990b15dc20fd145ef52e810f..44abd8f8a451913ba807a5fd68ef9279cdd9e5ac 100644
--- a/cc/layer_tree_host_unittest.cc
+++ b/cc/layer_tree_host_unittest.cc
@@ -1040,7 +1040,7 @@ public:
     {
         ASSERT_EQ(0u, m_layerTreeHost->settings().maxPartialTextureUpdates);
 
-        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->Context3D());
+        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->context3d());
 
         switch (impl->activeTree()->source_frame_number()) {
         case 0:
@@ -1082,7 +1082,7 @@ public:
 
     virtual void drawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE
     {
-        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->Context3D());
+        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->context3d());
 
         // Number of textures used for draw should always be one for each layer.
         EXPECT_EQ(2, context->NumUsedTextures());
@@ -1172,7 +1172,7 @@ public:
     {
         ASSERT_EQ(1u, m_layerTreeHost->settings().maxPartialTextureUpdates);
 
-        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->Context3D());
+        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->context3d());
 
         switch (impl->activeTree()->source_frame_number()) {
         case 0:
@@ -1257,7 +1257,7 @@ public:
 
     virtual void drawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE
     {
-        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->Context3D());
+        TestWebGraphicsContext3D* context = static_cast<TestWebGraphicsContext3D*>(impl->outputSurface()->context3d());
 
         // Number of textures used for drawing should one per layer except for
         // frame 3 where the viewport only contains one layer.