Fix a bug in updating physical backing size

ui/android/view_android.cc

Index: ui/android/view_android.cc
diff --git a/ui/android/view_android.cc b/ui/android/view_android.cc
index 8503cf837fff15a87f1cad682ea9519ffae8e002..78cea30ed70f160a79f40e38061eef4896bfe20d 100644
--- a/ui/android/view_android.cc
+++ b/ui/android/view_android.cc
@@ -126,7 +126,10 @@ void ViewAndroid::AddChild(ViewAndroid* child) {
   if (child->parent_)
     child->RemoveFromParent();
   child->parent_ = this;
-  child->OnPhysicalBackingSizeChanged(physical_size_);
+
+  // Physical backing size in WindowAndroid should not be propagated down.
+  if (this != GetWindowAndroid())

[boliu, 2017/05/17 16:21:12]

maybe more generally, don't propagate empty sizes?, or keep track of a bool
whether size is set explicitly?

[Jinsuk Kim, 2017/05/18 01:54:39]

Changed to checking empty size.

+    child->OnPhysicalBackingSizeChanged(physical_size_);
 }
 
 // static