Rename and clarify semantics of GrContext::resolveRenderTarget.

include/gpu/GrSurface.h

Index: include/gpu/GrSurface.h
diff --git a/include/gpu/GrSurface.h b/include/gpu/GrSurface.h
index 9d891493b00f9f3e97fc64f0c1e7d5948d613433..0de626d16e61c4217adc316046780f68807b0660 100644
--- a/include/gpu/GrSurface.h
+++ b/include/gpu/GrSurface.h
@@ -116,6 +116,13 @@ public:
      */
     void flushWrites();
 
+
+    /**
+     * After this returns any pending writes to the surface will be issued to the backend 3D API and
+     * if the surface has MSAA it will be resolved.
+     */
+    void prepareForExternalRead();
+    
     /** Access methods that are only to be used within Skia code. */
     inline GrSurfacePriv surfacePriv();
     inline const GrSurfacePriv surfacePriv() const;