Add support for creating texture backed images where Skia will delete the texture.

include/gpu/gl/GrGLInterface.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLInterface_DEFINED
 #define GrGLInterface_DEFINED
 
@@ skipping 216 matching lines @@
         GLPtr<GrGLGetStringiProc> fGetStringi;
         GLPtr<GrGLGetTexLevelParameterivProc> fGetTexLevelParameteriv;
         GLPtr<GrGLGetUniformLocationProc> fGetUniformLocation;
         GLPtr<GrGLInsertEventMarkerProc> fInsertEventMarker;
         GLPtr<GrGLInvalidateBufferDataProc> fInvalidateBufferData;
         GLPtr<GrGLInvalidateBufferSubDataProc> fInvalidateBufferSubData;
         GLPtr<GrGLInvalidateFramebufferProc> fInvalidateFramebuffer;
         GLPtr<GrGLInvalidateSubFramebufferProc> fInvalidateSubFramebuffer;
         GLPtr<GrGLInvalidateTexImageProc> fInvalidateTexImage;
         GLPtr<GrGLInvalidateTexSubImageProc> fInvalidateTexSubImage;
+        GLPtr<GrGLIsTextureProc> fIsTexture;
         GLPtr<GrGLLineWidthProc> fLineWidth;
         GLPtr<GrGLLinkProgramProc> fLinkProgram;
         GLPtr<GrGLMapBufferProc> fMapBuffer;
         GLPtr<GrGLMapBufferRangeProc> fMapBufferRange;
         GLPtr<GrGLMapBufferSubDataProc> fMapBufferSubData;
         GLPtr<GrGLMapTexSubImage2DProc> fMapTexSubImage2D;
         GLPtr<GrGLPixelStoreiProc> fPixelStorei;
         GLPtr<GrGLPopGroupMarkerProc> fPopGroupMarker;
         GLPtr<GrGLPushGroupMarkerProc> fPushGroupMarker;
         GLPtr<GrGLQueryCounterProc> fQueryCounter;
@@ skipping 249 matching lines @@
 #if GR_GL_PER_GL_FUNC_CALLBACK
     GrGLInterfaceCallbackProc fCallback;
     GrGLInterfaceCallbackData fCallbackData;
 #endif
 
     // This exists for internal testing.
     virtual void abandon() const {}
 };
 
 #endif