Plugin Power Saver: Unthrottle dynamically sized plugins correctly.

chrome/browser/plugins/plugin_power_saver_browsertest.cc

 // Copyright 2015 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 "base/command_line.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 206 matching lines @@
       "    type='application/x-ppapi-tests' width='400' height='100'></object>"
       "<object id='plugin2' data='http://otherorigin.com/fake2.swf' "
       "    type='application/x-ppapi-tests' width='400' height='500'>"
       "</object>");
   VerifyPluginMarkedEssential(GetActiveWebContents(), "plugin1");
   VerifyPluginMarkedEssential(GetActiveWebContents(), "plugin2");
 }
 
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, LargeCrossOriginObscured) {
   LoadHTML(
-      "<div style='width: 100px; height: 100px; overflow: hidden;'>"
+      "<div id='container' "
+      "    style='width: 400px; height: 100px; overflow: hidden;'>"
       "  <object id='plugin' data='http://otherorigin.com/fake.swf' "
       "      type='application/x-ppapi-tests' width='400' height='500'>"
       "  </object>"
       "</div>");
   VerifyPluginIsThrottled(GetActiveWebContents(), "plugin");
+
+  // Test that's unthrottled if it is unobscured.
+  std::string script =
+      "var container = window.document.getElementById('container');"
+      "container.setAttribute('style', 'width: 400px; height: 400px;');";
+  ASSERT_TRUE(content::ExecuteScript(GetActiveWebContents(), script));
+  VerifyPluginMarkedEssential(GetActiveWebContents(), "plugin");
+}
+
+IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, ExpandingSmallPlugin) {
+  LoadHTML(
+      "<object id='plugin' data='http://otherorigin.com/fake.swf' "
+      "    type='application/x-ppapi-tests' width='400' height='80'></object>");
+  VerifyPluginIsThrottled(GetActiveWebContents(), "plugin");
+
+  std::string script = "window.document.getElementById('plugin').height = 400;";
+  ASSERT_TRUE(content::ExecuteScript(GetActiveWebContents(), script));
+  VerifyPluginMarkedEssential(GetActiveWebContents(), "plugin");
 }
 
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, BackgroundTabPlugins) {
   std::string url_str =
       "data:text/html;charset=utf-8,"
       "<object id='same_origin' type='application/x-ppapi-tests'></object>"
       "<object id='small_cross_origin' data='http://otherorigin.com/fake1.swf' "
       "   type='application/x-ppapi-tests' width='400' height='100'></object>";
   ui_test_utils::NavigateToURLWithDisposition(
       browser(), GURL(url_str), NEW_BACKGROUND_TAB,
       ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
 
   ASSERT_EQ(2, browser()->tab_strip_model()->count());
   content::WebContents* background_contents =
       browser()->tab_strip_model()->GetWebContentsAt(1);
   EXPECT_TRUE(
       content::WaitForRenderFrameReady(background_contents->GetMainFrame()));
 
   EXPECT_FALSE(PluginLoaded(background_contents, "same_origin"));
   EXPECT_FALSE(PluginLoaded(background_contents, "small_cross_origin"));
 
   browser()->tab_strip_model()->SelectNextTab();
   EXPECT_EQ(background_contents, GetActiveWebContents());
 
   VerifyPluginMarkedEssential(background_contents, "same_origin");
   VerifyPluginIsThrottled(background_contents, "small_cross_origin");
 }