Add support to dump font cache texture for debug purposes

tools/render_pictures_main.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "LazyDecodeBitmap.h"
 #include "CopyTilesRenderer.h"
 #include "SkBitmap.h"
@@ skipping 422 matching lines @@
         failures += process_input(FLAGS_readPath[i], &outputDir, *renderer.get());
     }
     if (failures != 0) {
         SkDebugf("Failed to render %i pictures.\n", failures);
         return 1;
     }
 #if SK_SUPPORT_GPU
 #if GR_CACHE_STATS
     if (renderer->isUsingGpuDevice()) {
         GrContext* ctx = renderer->getGrContext();
-
         ctx->printCacheStats();
+        ctx->dumpFontCache();
     }
 #endif
 #endif
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif