Plugin Power Saver: Add comprehensive browser tests.

content/renderer/pepper/plugin_instance_throttler_impl.cc

 // Copyright 2014 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/plugin_instance_throttler_impl.h"
 
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/renderer/render_thread.h"
@@ skipping 117 matching lines @@
     RenderFrameImpl* frame,
     const GURL& content_origin,
     const std::string& plugin_module_name,
     const gfx::Size& unobscured_size) {
   unobscured_size_ = unobscured_size;
 
   // |frame| may be nullptr in tests.
   if (frame) {
     PluginPowerSaverHelper* helper = frame->plugin_power_saver_helper();
     bool cross_origin_main_content = false;
+
     if (!helper->ShouldThrottleContent(content_origin, plugin_module_name,
                                        unobscured_size.width(),
                                        unobscured_size.height(),
                                        &cross_origin_main_content)) {
       state_ = THROTTLER_STATE_MARKED_ESSENTIAL;
 
       if (cross_origin_main_content)
         helper->WhitelistContentOrigin(content_origin);
 
       return;
@@ skipping 63 matching lines @@
 
     // Release our reference to the underlying pixel data.
     last_received_frame_.reset();
   }
 
   state_ = THROTTLER_STATE_PLUGIN_THROTTLED;
   FOR_EACH_OBSERVER(Observer, observer_list_, OnThrottleStateChange());
 }
 
 }  // namespace content