cc: Refactor ResourceProvider.

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 56ce577b9d65110eda1e33f3f53a9992f558aabe..4eba00ba50f1c5df262cd66c91bf3c35c0af8c97 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -25,8 +25,11 @@
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
 #include "ui/gfx/frame_time.h"
 
+using gpu::gles2::GLES2Interface;
+
 namespace {
 
 // Measured in seconds.
@@ -1266,8 +1269,13 @@ void ThreadProxy::InitializeOutputSurfaceOnImplThread(
 void ThreadProxy::FinishGLOnImplThread(CompletionEvent* completion) {
   TRACE_EVENT0("cc", "ThreadProxy::FinishGLOnImplThread");
   DCHECK(IsImplThread());
-  if (impl().layer_tree_host_impl->resource_provider())
-    impl().layer_tree_host_impl->resource_provider()->Finish();
+  ResourceProvider* resource_provider =
+      impl().layer_tree_host_impl->resource_provider();

[danakj, 2014/07/10 17:01:44]

use the lthi->output_surface() instead, and null check the context_provider()

[sohanjg, 2014/07/11 16:43:33]

Done.

+  if (resource_provider) {
+    GLES2Interface* gl = resource_provider->ContextGL();
+    if (gl)
+      gl->Finish();
+  }
   completion->Signal();
 }