Fix image filters for PDF backend.

src/core/SkDevice.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 "SkDevice.h"
 #include "SkDeviceProperties.h"
 #include "SkDraw.h"
@@ skipping 18 matching lines @@
 }
 
 SkBaseDevice* SkBaseDevice::createCompatibleDevice(const SkImageInfo& info) {
     return this->onCreateDevice(info, kGeneral_Usage);
 }
 
 SkBaseDevice* SkBaseDevice::createCompatibleDeviceForSaveLayer(const SkImageInfo& info) {
     return this->onCreateDevice(info, kSaveLayer_Usage);
 }
 
+SkBaseDevice* SkBaseDevice::createCompatibleDeviceForImageFilter(const SkImageInfo& info) {
+    return this->onCreateDevice(info, kImageFilter_Usage);
+}
+
 SkMetaData& SkBaseDevice::getMetaData() {
     // metadata users are rare, so we lazily allocate it. If that changes we
     // can decide to just make it a field in the device (rather than a ptr)
     if (NULL == fMetaData) {
         fMetaData = new SkMetaData;
     }
     return *fMetaData;
 }
 
 SkImageInfo SkBaseDevice::imageInfo() const {
@@ skipping 131 matching lines @@
 
 void SkBaseDevice::EXPERIMENTAL_optimize(const SkPicture* picture) {
     // The base class doesn't perform any analysis but derived classes may
 }
 
 bool SkBaseDevice::EXPERIMENTAL_drawPicture(SkCanvas*, const SkPicture*, const SkMatrix*,
                                             const SkPaint*) {
     // The base class doesn't perform any accelerated picture rendering
     return false;
 }