Make copySurface work for texture dsts, return a bool, & add unit test.

include/gpu/GrContext.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 GrContext_DEFINED
 #define GrContext_DEFINED
 
@@ skipping 260 matching lines @@
                             size_t rowBytes,
                             uint32_t pixelOpsFlags = 0);
 
     /**
      * Copies a rectangle of texels from src to dst.
      * bounds.
      * @param dst           the surface to copy to.
      * @param src           the surface to copy from.
      * @param srcRect       the rectangle of the src that should be copied.
      * @param dstPoint      the translation applied when writing the srcRect's pixels to the dst.
-     * @param pixelOpsFlags see PixelOpsFlags enum above. (kUnpremul_PixelOpsFlag is not allowed).
      */
-    void copySurface(GrSurface* dst,
+    bool copySurface(GrSurface* dst,
                      GrSurface* src,
                      const SkIRect& srcRect,
-                     const SkIPoint& dstPoint,
-                     uint32_t pixelOpsFlags = 0);
+                     const SkIPoint& dstPoint);
 
     /** Helper that copies the whole surface but fails when the two surfaces are not identically
         sized. */
     bool copySurface(GrSurface* dst, GrSurface* src) {
-        if (NULL == dst || NULL == src || dst->width() != src->width() ||
-            dst->height() != src->height()) {
-            return false;
-        }
-        this->copySurface(dst, src, SkIRect::MakeWH(dst->width(), dst->height()),
-                          SkIPoint::Make(0,0));
-        return true;
+        return this->copySurface(dst, src, SkIRect::MakeWH(dst->width(), dst->height()),
+                                 SkIPoint::Make(0,0));
     }
 
     /**
      * After this returns any pending writes to the surface will have been issued to the backend 3D API.
      */
     void flushSurfaceWrites(GrSurface* surface);
 
     /**
      * Finalizes all pending reads and writes to the surface and also performs an MSAA resolve
      * if necessary.
@@ skipping 144 matching lines @@
     /**
      * A callback similar to the above for use by the TextBlobCache
      * TODO move textblob draw calls below context so we can use the call above.
      */
     static void TextBlobCacheOverBudgetCB(void* data);
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif