Add hooks for GL_EXT_debug_marker in gpu

src/gpu/GrDrawTarget.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED
 
@@ skipping 405 matching lines @@
      * clip and all other draw state (blend mode, stages, etc). Clears the
      * whole thing if rect is NULL, otherwise just the rect. If canIgnoreRect
      * is set then the entire render target can be optionally cleared.
      */
     virtual void clear(const SkIRect* rect,
                        GrColor color,
                        bool canIgnoreRect,
                        GrRenderTarget* renderTarget = NULL) = 0;
 
     /**
+     * instantGpuTraceEvent places a single "sign post" type marker into command stream. The
+     * argument marker will be the name of the annotation that is added.
+     */
+    void instantGpuTraceEvent(const char* marker);
+    /**
+     * The following two functions are used for marking groups of commands. Use pushGpuTraceEvent
+     * to set the beginning of a command set, and popGpuTraceEvent is be called at end of the
+     * command set. The argument marker is the name for the annotation that is added. The push and
+     * pops can be used hierarchically, but every push must have a match pop.
+     */
+    void pushGpuTraceEvent(const char* marker);
+    void popGpuTraceEvent();
+
+    /**
      * Copies a pixel rectangle from one surface to another. This call may finalize
      * reserved vertex/index data (as though a draw call was made). The src pixels
      * copied are specified by srcRect. They are copied to a rect of the same
      * size in dst with top left at dstPoint. If the src rect is clipped by the
      * src bounds then  pixel values in the dst rect corresponding to area clipped
      * by the src rect are not overwritten. This method can fail and return false
      * depending on the type of surface, configs, etc, and the backend-specific
      * limitations. If rect is clipped out entirely by the src or dst bounds then
      * true is returned since there is no actual copy necessary to succeed.
      */
@@ skipping 411 matching lines @@
     // drawNonIndexed from reserved vertex space.
     virtual void onDrawRect(const SkRect& rect,
                             const SkMatrix* matrix,
                             const SkRect* localRect,
                             const SkMatrix* localMatrix);
 
     virtual void onStencilPath(const GrPath*, SkPath::FillType) = 0;
     virtual void onDrawPath(const GrPath*, SkPath::FillType,
                             const GrDeviceCoordTexture* dstCopy) = 0;
 
+    virtual void onInstantGpuTraceEvent(const char* marker) = 0;
+    virtual void onPushGpuTraceEvent(const char* marker) = 0;
+    virtual void onPopGpuTraceEvent() = 0;
+
     // helpers for reserving vertex and index space.
     bool reserveVertexSpace(size_t vertexSize,
                             int vertexCount,
                             void** vertices);
     bool reserveIndexSpace(int indexCount, void** indices);
 
     // called by drawIndexed and drawNonIndexed. Use a negative indexCount to
     // indicate non-indexed drawing.
     bool checkDraw(GrPrimitiveType type, int startVertex,
                    int startIndex, int vertexCount,
@@ skipping 14 matching lines @@
 
     enum {
         kPreallocGeoSrcStateStackCnt = 4,
     };
     SkSTArray<kPreallocGeoSrcStateStackCnt, GeometrySrcState, true> fGeoSrcStateStack;
     const GrClipData*                                               fClip;
     GrDrawState*                                                    fDrawState;
     GrDrawState                                                     fDefaultDrawState;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by DrawTarget.
     GrContext*                                                      fContext;
+    // To keep track that we always have at least as many debug marker pushes as pops
+    int                                                             fPushGpuTraceCount;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif