cc: Split Proxy and TaskRunnerProvider for the LayerTreeHost

cc/trees/layer_tree_host_pixeltest_readback.cc

Index: cc/trees/layer_tree_host_pixeltest_readback.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_readback.cc b/cc/trees/layer_tree_host_pixeltest_readback.cc
index c35d66b77d68976e07f5c8e7251b1a8c8cb6dfe7..d7f0a92b1ee64196943d98230efdf45bb881425f 100644
--- a/cc/trees/layer_tree_host_pixeltest_readback.cc
+++ b/cc/trees/layer_tree_host_pixeltest_readback.cc
@@ -105,14 +105,14 @@ class LayerTreeHostReadbackPixelTest
   }
 
   void ReadbackResultAsBitmap(scoped_ptr<CopyOutputResult> result) {
-    EXPECT_TRUE(proxy()->IsMainThread());
+    EXPECT_TRUE(task_runner_provider()->IsMainThread());
     EXPECT_TRUE(result->HasBitmap());
     result_bitmap_ = result->TakeBitmap().Pass();
     EndTest();
   }
 
   void ReadbackResultAsTexture(scoped_ptr<CopyOutputResult> result) {
-    EXPECT_TRUE(proxy()->IsMainThread());
+    EXPECT_TRUE(task_runner_provider()->IsMainThread());
     EXPECT_TRUE(result->HasTexture());
 
     TextureMailbox texture_mailbox;