Add onMemoryDump to GrContext

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 64f4f6ce30e6609b0d8ca3b1dd99cdde35739a86..17751664196ce850022382e7d9b809744e953b7c 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -43,6 +43,7 @@ class GrTextureParams;
 class GrVertexBuffer;
 class GrStrokeInfo;
 class GrSoftwarePathRenderer;
+class SkTraceMemoryDump;
 
 class SK_API GrContext : public SkRefCnt {
 public:
@@ -358,6 +359,9 @@ public:
         to an array of 3 entries */
     void setTextContextAtlasSizes_ForTesting(const GrBatchAtlasConfig* configs);
 
+    /** Enumerates all cached GPU resources and dumps their memory to traceMemoryDump. */
+    void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const;
+
 private:
     GrGpu*                          fGpu;
     const GrCaps*                   fCaps;