Have GMs read the GrContext via a setter/getter rather than a global.

gm/gm.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 skiagm_DEFINED
 #define skiagm_DEFINED
 
 #include "SkBitmap.h"
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkSize.h"
 #include "SkString.h"
 #include "SkTRegistry.h"
 
+#if SK_SUPPORT_GPU
+#include "GrContext.h"
+#endif
+
 #define DEF_GM(code) \
     static skiagm::GM*          SK_MACRO_APPEND_LINE(F_)(void*) { code; } \
     static skiagm::GMRegistry   SK_MACRO_APPEND_LINE(R_)(SK_MACRO_APPEND_LINE(F_));
 
 namespace skiagm {
 
     static inline SkISize make_isize(int w, int h) {
         SkISize sz;
         sz.set(w, h);
         return sz;
@@ skipping 57 matching lines @@
 
         static SkString& GetResourcePath() {
             return gResourcePath;
         }
 
         bool isCanvasDeferred() const { return fCanvasIsDeferred; }
         void setCanvasIsDeferred(bool isDeferred) {
             fCanvasIsDeferred = isDeferred;
         }
 
+#if SK_SUPPORT_GPU
+        static GrContext* GetGr(/*very nearly const*/ SkCanvas*);
+#endif
+
     protected:
         static SkString gResourcePath;
 
         virtual void onOnceBeforeDraw() {}
         virtual void onDraw(SkCanvas*) = 0;
         virtual void onDrawBackground(SkCanvas*);
         virtual SkISize onISize() = 0;
         virtual SkString onShortName() = 0;
         virtual uint32_t onGetFlags() const { return 0; }
         virtual SkMatrix onGetInitialTransform() const { return SkMatrix::I(); }
 
     private:
         SkString fShortName;
         SkColor  fBGColor;
         bool     fCanvasIsDeferred; // work-around problem in srcmode.cpp
         bool     fHaveCalledOnceBeforeDraw;
     };
 
     typedef SkTRegistry<GM*(*)(void*)> GMRegistry;
 }
 
 #endif