Canvas size initializes correctly when drawing from a skia picture

Review URL: https://codereview.appspot.com/6450065

git-svn-id: http://skia.googlecode.com/svn/trunk@4837 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/debugger/SkDebugCanvas.h b/debugger/SkDebugCanvas.h
index 373ef5d..fa2d757 100644
--- a/debugger/SkDebugCanvas.h
+++ b/debugger/SkDebugCanvas.h
@@ -18,7 +18,7 @@
 
 class SkDebugCanvas : public SkCanvas {
 public:
-    SkDebugCanvas();
+    SkDebugCanvas(int width, int height);
     ~SkDebugCanvas();
 
     void toggleFilter(bool toggle);