cc, gpu: Use RGBA when using msaa on systems that don't support BGRA

cc/test/fake_tile_manager.cc

Index: cc/test/fake_tile_manager.cc
diff --git a/cc/test/fake_tile_manager.cc b/cc/test/fake_tile_manager.cc
index 53f88dad4a32accc79a9ccc0b079da5f7b43fb91..146da3730ce61196d0096a6700177c0f9e88b997 100644
--- a/cc/test/fake_tile_manager.cc
+++ b/cc/test/fake_tile_manager.cc
@@ -47,7 +47,10 @@ class FakeTileTaskRunnerImpl : public TileTaskRunner, public TileTaskClient {
     }
     completed_tasks_.clear();
   }
-  ResourceFormat GetResourceFormat() override { return RGBA_8888; }
+  ResourceFormat GetResourceFormat() const override { return RGBA_8888; }
+  bool GetResourceRequiresSwizzle() const override {
+    return !PlatformColor::SameComponentOrder(GetResourceFormat());
+  }
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(