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

cc/resources/resource_provider.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <deque>
 #include <set>
 #include <string>
@@ skipping 381 matching lines @@
     ~SynchronousFence() override;
 
     void Synchronize();
 
     gpu::gles2::GLES2Interface* gl_;
     bool has_synchronized_;
 
     DISALLOW_COPY_AND_ASSIGN(SynchronousFence);
   };
 
+  // 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;
+    void Wait() override;
+
+   private:
+    ~CopyTextureFence() override {}
+
+    void ProcessResult();
+
+    gpu::gles2::GLES2Interface* gl_;
+    unsigned query_id_;
+
+    DISALLOW_COPY_AND_ASSIGN(CopyTextureFence);
+  };
+
   // Acquire pixel buffer for resource. The pixel buffer can be used to
   // set resource pixels without performing unnecessary copying.
   void AcquirePixelBuffer(ResourceId resource);
   void ReleasePixelBuffer(ResourceId resource);
   // Map/unmap the acquired pixel buffer.
   uint8_t* MapPixelBuffer(ResourceId id, int* stride);
   void UnmapPixelBuffer(ResourceId id);
   // Asynchronously update pixels from acquired pixel buffer.
   void BeginSetPixels(ResourceId id);
   void ForceSetPixelsToComplete(ResourceId id);
@@ skipping 253 matching lines @@
   return format_gl_data_format[format];
 }
 
 inline GLenum GLInternalFormat(ResourceFormat format) {
   return GLDataFormat(format);
 }
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_