Change device factories to take SkImageInfo instead of SkBitmap::Config

patch from issue 167033002

BUG=skia:
R=reed@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/168653002

git-svn-id: http://skia.googlecode.com/svn/trunk@13463 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index 92d0487..a7ec7ae 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -172,13 +172,10 @@
     virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
         not_supported();
     }
-    virtual SkBaseDevice* onCreateCompatibleDevice(SkBitmap::Config config,
-                                                   int width, int height,
-                                                   bool isOpaque,
-                                                   Usage usage) SK_OVERRIDE {
+    virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
         // we expect to only get called via savelayer, in which case it is fine.
         SkASSERT(kSaveLayer_Usage == usage);
-        return SkNEW_ARGS(GatherPixelRefDevice, (width, height, fPRSet));
+        return SkNEW_ARGS(GatherPixelRefDevice, (info.width(), info.height(), fPRSet));
     }
     virtual void flush() SK_OVERRIDE {}