[polymer] Merge of master into polymer10-migration

tracing/tracing/ui/base/drag_handle.html

Index: tracing/tracing/ui/base/drag_handle.html
diff --git a/tracing/tracing/ui/base/drag_handle.html b/tracing/tracing/ui/base/drag_handle.html
index d7238066c2e99f85de31f939cd4f531cd5749fb9..032705b8ff0a4b68c0f1fd01227f3e38445129c0 100644
--- a/tracing/tracing/ui/base/drag_handle.html
+++ b/tracing/tracing/ui/base/drag_handle.html
@@ -51,8 +51,6 @@ found in the LICENSE file.
 Polymer({
   is: 'tr-ui-b-drag-handle',
 
-  __proto__: HTMLDivElement.prototype,
-
   created: function() {
     this.lastMousePos_ = 0;
     this.onMouseMove_ = this.onMouseMove_.bind(this);
@@ -141,6 +139,7 @@ Polymer({
   setTargetSize_: function(s) {
     this.target_.style[this.targetStyleKey_] = s + 'px';
     this.targetSizesByModeKey_[this.modeKey_] = s;
+    tr.b.dispatchSimpleEvent(this, 'drag-handle-resize', true, false);
   },
 
   applyDelta_: function(delta) {