cc: Partial tile update for one-copy raster.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 393751eeeb1482ed80fe303032c87cb420bfaa2f..1ed66f0e1fa58a87a7007a676ef2b6b08dd47b9e 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -319,7 +319,11 @@ class CC_EXPORT ResourceProvider {
                                    ResourceId resource_id);
     ~ScopedWriteLockGpuMemoryBuffer();
 
-    gfx::GpuMemoryBuffer* GetGpuMemoryBuffer();
+    // If |persistent| is true, the contents of the buffer will remain the same
+    // each time you lock and use it.
+    bool AllocateGpuMemoryBuffer(bool persistent);

[reveman, 2015/05/22 17:15:13]

To allocate with MAP_PERSISTENT usage or not is NOT an option. Please keep all
this as before and simply pass the GMB usage mode to the ResourceProvider ctor.
If the embedder tells us to use MAP_PERSISTENT then we have no choice but use
MAP_PERSISTENT. Texture target will be wrong otherwise.

[danakj, 2015/05/26 19:02:52]

Ah, ya okay that sounds good.

[danakj, 2015/05/26 23:37:34]

Done.

+
+    gfx::GpuMemoryBuffer* gpu_memory_buffer() { return gpu_memory_buffer_; }
 
    private:
     ResourceProvider* resource_provider_;