Add hooks for GL_EXT_debug_marker in gpu

src/gpu/GrInOrderDrawBuffer.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 GrInOrderDrawBuffer_DEFINED
 #define GrInOrderDrawBuffer_DEFINED
 
@@ skipping 150 matching lines @@
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint)  SK_OVERRIDE;
     virtual bool onCanCopySurface(GrSurface* dst,
                                   GrSurface* src,
                                   const SkIRect& srcRect,
                                   const SkIPoint& dstPoint) SK_OVERRIDE;
 
     bool quickInsideClip(const SkRect& devBounds);
 
+    virtual void onInstantGpuTraceEvent(const char* marker) SK_OVERRIDE;
+    virtual void onPushGpuTraceEvent(const char* marker) SK_OVERRIDE;
+    virtual void onPopGpuTraceEvent() SK_OVERRIDE;
+
+
     // Attempts to concat instances from info onto the previous draw. info must represent an
     // instanced draw. The caller must have already recorded a new draw state and clip if necessary.
     int concatInstancedDraw(const DrawInfo& info);
 
     // we lazily record state and clip changes in order to skip clips and states that have no
     // effect.
     bool needsNewState() const;
     bool needsNewClip() const;
 
     // these functions record a command
@@ skipping 59 matching lines @@
 
     virtual bool       isIssued(uint32_t drawID) { return drawID != fDrawID; }
 
     bool                            fFlushing;
     uint32_t                        fDrawID;
 
     typedef GrDrawTarget INHERITED;
 };
 
 #endif