Rename setVisibility to setVisibilityCHROMIUM and expose as GL_CHROIMIUM_set_visibility extension.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
diff --git a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
index e7ba2b6883e20b2d14f4d0bfb61077d4389fb5af..01bf4790789704c260dad4cc0bad632c44dc960d 100644
--- a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
+++ b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
@@ -74,8 +74,6 @@ class WebGraphicsContext3DCommandBufferImpl
 
   virtual void reshape(int width, int height);
 
-  virtual void setVisibility(bool visible);
-
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size);
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size,
                                    WebGLId framebuffer, int width, int height);
@@ -412,6 +410,8 @@ class WebGraphicsContext3DCommandBufferImpl
       WGC3Denum access);
   virtual void unmapTexSubImage2DCHROMIUM(const void*);
 
+  virtual void setVisibilityCHROMIUM(bool visible);
+
   virtual void copyTextureToParentTextureCHROMIUM(
       WebGLId texture, WebGLId parentTexture);