Replace WGC3D visibility extension with resource_usage extension. [Part 2 of 3]

ui/gfx/gl/gl_surface.h

Index: ui/gfx/gl/gl_surface.h
diff --git a/ui/gfx/gl/gl_surface.h b/ui/gfx/gl/gl_surface.h
index a42afab564aae5ab64fb4c6f78f427beaa108763..ad76369549aaa2c618135ae21236ce7f1069c845 100644
--- a/ui/gfx/gl/gl_surface.h
+++ b/ui/gfx/gl/gl_surface.h
@@ -71,9 +71,16 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // on error.
   virtual bool OnMakeCurrent(GLContext* context);
 
+  // Graphics Resource Usage
+  enum ResourceUsage {
+      RESOURCE_USAGE_FULL,
+      RESOURCE_USAGE_LESS,
+      RESOURCE_USAGE_NONE,
+  };
+
   // This gives a hint as to whether this surface is visible. If it is not
   // visible, the backing store need not be preserved.
-  virtual void SetVisible(bool visible);
+  virtual void SetResourceUsage(ResourceUsage resourceUsage);
 
   // Get a handle used to share the surface with another process. Returns null
   // if this is not possible.
@@ -130,7 +137,7 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   virtual void* GetHandle() OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual bool OnMakeCurrent(GLContext* context) OVERRIDE;
-  virtual void SetVisible(bool visible) OVERRIDE;
+  virtual void SetResourceUsage(ResourceUsage resourceUsage) OVERRIDE;
   virtual void* GetShareHandle() OVERRIDE;
   virtual void* GetDisplay() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;