When cache is full delay flush until GrContext draw is finished

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 5b25fe4697c80e22176f6daba5220ddd512bd0af..973185c320ea15d72f0abeb13591d74c86108446 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -877,6 +877,9 @@ private:
     GrIndexBufferAllocPool*         fDrawBufferIBAllocPool;
     GrInOrderDrawBuffer*            fDrawBuffer;
 
+    // Set by OverbudgetCB() to request that GrContext flush before exiting a draw.
+    bool                            fFlushToReduceCacheSize;
+
     GrAARectRenderer*               fAARectRenderer;
     GrOvalRenderer*                 fOvalRenderer;
 
@@ -899,9 +902,10 @@ private:
     void setupDrawBuffer();
 
     class AutoRestoreEffects;
+    class AutoCheckFlush;
     /// Sets the paint and returns the target to draw into. The paint can be NULL in which case the
     /// draw state is left unmodified.
-    GrDrawTarget* prepareToDraw(const GrPaint*, BufferedDraw, AutoRestoreEffects*);
+    GrDrawTarget* prepareToDraw(const GrPaint*, BufferedDraw, AutoRestoreEffects*, AutoCheckFlush*);
 
     void internalDrawPath(GrDrawTarget* target, bool useAA, const SkPath& path,
                           const SkStrokeRec& stroke);