Revert "switch GatherPixelRefs to use SkBaseDevice instead of SkBitmapDevice"

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrTextureDomainEffect.h"
@@ skipping 495 matching lines @@
             copy.setColor(SkColorSetA(color, newA));
             return skPaint2GrPaintNoShader(dev, copy, false, constantColor, grPaint);
         } else {
             return false;
         }
     }
 }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
+void SkGpuDevice::getGlobalBounds(SkIRect* bounds) const {
+    if (NULL != bounds) {
+        const SkIPoint& origin = this->getOrigin();
+        bounds->setXYWH(origin.x(), origin.y(),
+                        this->width(), this->height());
+    }
+}
 
 SkBitmap::Config SkGpuDevice::config() const {
     if (NULL == fRenderTarget) {
         return SkBitmap::kNo_Config;
     }
 
     bool isOpaque;
     return grConfig2skConfig(fRenderTarget->config(), &isOpaque);
 }
 
@@ skipping 1317 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }