WebViewPlugin: Make WebView resize take place synchronously.

components/plugins/renderer/webview_plugin.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/plugins/renderer/webview_plugin.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 191 matching lines @@
 }
 
 // Coordinates are relative to the containing window.
 void WebViewPlugin::updateGeometry(const WebRect& window_rect,
                                    const WebRect& clip_rect,
                                    const WebRect& unobscured_rect,
                                    const WebVector<WebRect>& cut_outs_rects,
                                    bool is_visible) {
   DCHECK(container_);
 
+  base::AutoReset<bool> is_resizing(&is_resizing_, true);
+
+  if (static_cast<gfx::Rect>(window_rect) != rect_) {
+    rect_ = window_rect;
+    web_view_->resize(rect_.size());
+  }
+
   // Plugin updates are forbidden during Blink layout. Therefore,
   // UpdatePluginForNewGeometry must be posted to a task to run asynchronously.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&WebViewPlugin::UpdatePluginForNewGeometry,
                  weak_factory_.GetWeakPtr(), window_rect, unobscured_rect));
 }
 
 void WebViewPlugin::updateFocus(bool focused, blink::WebFocusType focus_type) {
   focused_ = focused;
@@ skipping 119 matching lines @@
   if (container_) {
     web_view_->setZoomLevel(
       blink::WebView::zoomFactorToZoomLevel(container_->pageZoomFactor()));
   }
 }
 
 void WebViewPlugin::UpdatePluginForNewGeometry(
     const blink::WebRect& window_rect,
     const blink::WebRect& unobscured_rect) {
   DCHECK(container_);
+  if (!delegate_)
+    return;
 
-  base::AutoReset<bool> is_resizing(&is_resizing_, true);
-
-  if (static_cast<gfx::Rect>(window_rect) != rect_) {
-    rect_ = window_rect;
-    web_view_->resize(rect_.size());
-  }
-
-  if (delegate_) {
-    delegate_->OnUnobscuredRectUpdate(gfx::Rect(unobscured_rect));
-    // The delegate may have dirtied style and layout of the WebView.
-    // See for example the resizePoster function in plugin_poster.html.
-    // Run the lifecycle now so that it is clean.
-    web_view_->updateAllLifecyclePhases();
-  }
+  // The delegate may instantiate a new plugin.
+  delegate_->OnUnobscuredRectUpdate(gfx::Rect(unobscured_rect));
+  // The delegate may have dirtied style and layout of the WebView.
+  // See for example the resizePoster function in plugin_poster.html.
+  // Run the lifecycle now so that it is clean.
+  web_view_->updateAllLifecyclePhases();
 }