Fix page zoom to be frame-centric for out-of-process frames.

third_party/WebKit/public/web/WebView.h

Index: third_party/WebKit/public/web/WebView.h
diff --git a/third_party/WebKit/public/web/WebView.h b/third_party/WebKit/public/web/WebView.h
index a04be6d1b3447e5faa34fec1a95e41773138919e..0618124be1c6e489a2ac373316bc8be83279ade7 100644
--- a/third_party/WebKit/public/web/WebView.h
+++ b/third_party/WebKit/public/web/WebView.h
@@ -205,6 +205,9 @@ public:
     // change.
     virtual double setZoomLevel(double) = 0;
 
+    // Sets the zoom level for the specified WebLocalFrame.

[alexmos, 2016/04/07 01:20:56]

nit: add "and its local descendants" or something like that, depending on how
your page-level message exploration goes and how this ends up being used.

[wjmaclean, 2016/04/07 12:55:36]

This disappears in the new patch.

+    virtual double setZoomLevelForFrame(WebLocalFrame*, double zoomLevel) = 0;
+
     // Updates the zoom limits for this view.
     virtual void zoomLimitsChanged(double minimumZoomLevel,
                                    double maximumZoomLevel) = 0;