aw: Add command switch to disable hardware acceleration

android_webview/native/java_browser_view_renderer_helper.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "android_webview/native/java_browser_view_renderer_helper.h"
 
 #include <android/bitmap.h>
 
+#include "android_webview/common/aw_switches.h"
 #include "android_webview/public/browser/draw_sw.h"
 #include "base/debug/trace_event.h"
 #include "jni/JavaBrowserViewRendererHelper_jni.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/utils/SkCanvasStateUtils.h"
 
 using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace android_webview {
 
 namespace {
 
 // Provides software rendering functions from the Android glue layer.
 // Allows preventing extra copies of data when rendering.
 AwDrawSWFunctionTable* g_sw_draw_functions = NULL;
 
 class ScopedPixelAccess {
  public:
   ScopedPixelAccess(JNIEnv* env, jobject java_canvas) : pixels_(NULL) {
-    if (g_sw_draw_functions)
+    if (g_sw_draw_functions && !switches::ForceAuxiliaryBitmap())
       pixels_ = g_sw_draw_functions->access_pixels(env, java_canvas);
   }
 
   ~ScopedPixelAccess() {
     if (pixels_)
       g_sw_draw_functions->release_pixels(pixels_);
   }
 
   AwPixelInfo* pixels() { return pixels_; }
 
@@ skipping 127 matching lines @@
 
   if (AndroidBitmap_unlockPixels(env, jbitmap.obj()) < 0) {
     LOG(ERROR) << "Error unlocking java bitmap pixels.";
     return false;
   }
 
   return succeeded;
 }
 
 }  // namespace android_webview