Plugin Power Saver: Throttle 'large' plugins that appear small.

content/renderer/pepper/pepper_plugin_instance_impl.cc

 // Copyright (c) 2012 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 "content/renderer/pepper/pepper_plugin_instance_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 789 matching lines @@
 bool PepperPluginInstanceImpl::Initialize(
     const std::vector<std::string>& arg_names,
     const std::vector<std::string>& arg_values,
     bool full_frame,
     scoped_ptr<PluginInstanceThrottlerImpl> throttler) {
   DCHECK(!throttler_);
 
   if (!render_frame_)
     return false;
 
+  // Get plugin dimensions directly.
+  blink::WebElement element = container()->element();
+  blink::WebRect bounds = element.boundsInViewportSpace();
+  int width = bounds.width;
+  int height = bounds.height;
+
+  // Plugins are sometimes only partially visible. This is to support content
+  // that may expand. Walk up the DOM tree here to find a parent container
+  // that is smaller, and use that as the plugin's effective visible size.
+  blink::WebNode node = element.parentNode();
+  while (!node.isNull() && node.isElementNode()) {
+    blink::WebRect bounds = node.to<WebElement>().boundsInViewportSpace();

[Lei Zhang, 2015/03/18 00:48:12]

You can change the type of |bounds| to gfx::Rect() and use SetToMin() below.

[tommycli, 2015/03/19 22:10:12]

Done.

+
+    if (bounds.width < width)
+      width = bounds.width;
+    if (bounds.height < height)
+      height = bounds.height;
+
+    node = node.parentNode();
+  }
+
   if (is_flash_plugin_ && RenderThread::Get()) {
     RenderThread::Get()->RecordAction(
         base::UserMetricsAction("Flash.PluginInstanceCreated"));
-    blink::WebRect bounds = container()->element().boundsInViewportSpace();
-    RecordFlashSizeMetric(bounds.width, bounds.height);
+    RecordFlashSizeMetric(width, height);
   }
 
   if (throttler) {
     throttler_ = throttler.Pass();
     throttler_->AddObserver(this);
     throttler_->Initialize(render_frame_, plugin_url_.GetOrigin(),
-                           module()->name(),
-                           container()->element().boundsInViewportSpace());
+                           module()->name(), gfx::Size(width, height));
   }
 
   message_channel_ = MessageChannel::Create(this, &message_channel_object_);
 
   full_frame_ = full_frame;
 
   UpdateTouchEventRequest();
   container_->setWantsWheelEvents(IsAcceptingWheelEvents());
 
   SetGPUHistogram(ppapi::Preferences(PpapiPreferencesBuilder::Build(
@@ skipping 2483 matching lines @@
 
 void PepperPluginInstanceImpl::RecordFlashJavaScriptUse() {
   if (initialized_ && !javascript_used_ && is_flash_plugin_) {
     javascript_used_ = true;
     RenderThread::Get()->RecordAction(
         base::UserMetricsAction("Flash.JavaScriptUsed"));
   }
 }
 
 }  // namespace content