render_pictures: add --mismatchPath flag

When set, it will only write out images that don't match expectations.

BUG=skia:1942
R=rmistry@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/283123002

git-svn-id: http://skia.googlecode.com/svn/trunk@14748 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/CopyTilesRenderer.h b/tools/CopyTilesRenderer.h
index ef1ccb0..3bf969b 100644
--- a/tools/CopyTilesRenderer.h
+++ b/tools/CopyTilesRenderer.h
@@ -23,7 +23,8 @@
 
     public:
         CopyTilesRenderer(int x, int y);
-        virtual void init(SkPicture* pict, const SkString* outputDir, const SkString* inputFilename,
+        virtual void init(SkPicture* pict, const SkString* writePath, const SkString* mismatchPath,
+                          const SkString* inputFilename,
                           bool useChecksumBasedFilenames) SK_OVERRIDE;
 
         /**