hide virtuals on device for width/height/isopaque

R=bsalomon@google.com
NOTREECHECKS=True

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/334993002
diff --git a/src/utils/SkPictureUtils.cpp b/src/utils/SkPictureUtils.cpp
index 46a0660..702a78d 100644
--- a/src/utils/SkPictureUtils.cpp
+++ b/src/utils/SkPictureUtils.cpp
@@ -58,9 +58,9 @@
         fPRSet = prset;
     }
 
-    virtual int width() const SK_OVERRIDE { return fSize.width(); }
-    virtual int height() const SK_OVERRIDE { return fSize.height(); }
-    virtual bool isOpaque() const SK_OVERRIDE { return false; }
+    virtual SkImageInfo imageInfo() const SK_OVERRIDE {
+        return SkImageInfo::MakeUnknown(fSize.width(), fSize.height());
+    }
     virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
     virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
         return false;