cc: [WIP] Use worker context and OrderingBarrierCHROMIUM for one-copy.

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 449e04be23750e28d015ef04a50014eee0977f00..bed47f4ac69607672d8082b602e5e91cea528dbf 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -207,48 +207,30 @@ class BufferIdAllocator : public IdAllocator {
   DISALLOW_COPY_AND_ASSIGN(BufferIdAllocator);
 };
 
-// Query object based fence implementation used to detect completion of copy
-// texture operations. Fence has passed when query result is available.
-class CopyTextureFence : public ResourceProvider::Fence {
- public:
-  CopyTextureFence(gpu::gles2::GLES2Interface* gl, unsigned query_id)
-      : gl_(gl), query_id_(query_id) {}
-
-  // Overridden from ResourceProvider::Fence:
-  void Set() override {}
-  bool HasPassed() override {
-    unsigned available = 1;
-    gl_->GetQueryObjectuivEXT(
-        query_id_, GL_QUERY_RESULT_AVAILABLE_EXT, &available);
-    if (!available)
-      return false;
+}  // namespace
 
-    ProcessResult();
-    return true;
+bool ResourceProvider::CopyTextureFence::HasPassed() {
+  unsigned available = 1;
+  gl_->GetQueryObjectuivEXT(query_id_, GL_QUERY_RESULT_AVAILABLE_EXT,
+                            &available);
+  if (!available)
+    return false;
+
+  ProcessResult();
+  return true;
   }
-  void Wait() override {
+  void ResourceProvider::CopyTextureFence::Wait() {
     // ProcessResult() will wait for result to become available.
     ProcessResult();
   }
 
- private:
-  ~CopyTextureFence() override {}
-
-  void ProcessResult() {
+  void ResourceProvider::CopyTextureFence::ProcessResult() {
     unsigned time_elapsed_us = 0;
     gl_->GetQueryObjectuivEXT(query_id_, GL_QUERY_RESULT_EXT, &time_elapsed_us);
     UMA_HISTOGRAM_CUSTOM_COUNTS("Renderer4.CopyTextureLatency", time_elapsed_us,
                                 0, 256000, 50);
   }
 
-  gpu::gles2::GLES2Interface* gl_;
-  unsigned query_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(CopyTextureFence);
-};
-
-}  // namespace
-
 ResourceProvider::Resource::~Resource() {}
 
 ResourceProvider::Resource::Resource(GLuint texture_id,