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

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 4e051349df677dd1cd701dbbb682effbd3b8a8b3..ca7400736409d5054df1c206c0be915bf6b9d3c8 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -807,19 +807,38 @@ bool PepperPluginInstanceImpl::Initialize(
   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();
+
+    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(), width, height);
   }
 
   message_channel_ = MessageChannel::Create(this, &message_channel_object_);