Revert of remove (now unneeded) legacy onDrawPicture variant (https://codereview.chromium.org/456203002/)

Reason for revert:
still need to update ProfilingCanvas in blink

Original issue's description:
> remove (now unneeded) legacy onDrawPicture variant
>
> TBR=fmalita@google.com
>
> Committed: https://skia.googlesource.com/skia/+/2e69d292e5a389db7d9264eb66172376692de8ca

TBR=
NOTREECHECKS=true
NOTRY=true

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/457253002
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 011e3c3..791511e 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -1237,6 +1237,8 @@
 
     virtual void onDiscard();
 
+    // temporary, until we can migrate existing overrides in chrome
+    virtual void onDrawPicture(const SkPicture*) {}
     virtual void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*);
 
     // Returns the canvas to be used by DrawIter. Default implementation
diff --git a/include/utils/SkProxyCanvas.h b/include/utils/SkProxyCanvas.h
index b340141..2e002cc 100644
--- a/include/utils/SkProxyCanvas.h
+++ b/include/utils/SkProxyCanvas.h
@@ -79,6 +79,8 @@
     virtual void onClipPath(const SkPath&, SkRegion::Op, ClipEdgeStyle) SK_OVERRIDE;
     virtual void onClipRegion(const SkRegion&, SkRegion::Op) SK_OVERRIDE;
 
+    // temporary until we can land and fix chrome
+    virtual void onDrawPicture(const SkPicture*) SK_OVERRIDE {}
     virtual void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) SK_OVERRIDE;
 
 private: