Browser Plugin: Update DOM Node attributes when properties are updated

content/renderer/browser_plugin/browser_plugin.cc

Index: content/renderer/browser_plugin/browser_plugin.cc
diff --git a/content/renderer/browser_plugin/browser_plugin.cc b/content/renderer/browser_plugin/browser_plugin.cc
index a2c0ed0a5ea10bd3e55e91d59f33a5780092191c..c0e255ea54eaea7f901d2cfdba5d7b1513a4e55d 100644
--- a/content/renderer/browser_plugin/browser_plugin.cc
+++ b/content/renderer/browser_plugin/browser_plugin.cc
@@ -6,6 +6,7 @@
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/message_loop.h"
+#include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "content/common/browser_plugin_messages.h"
@@ -66,8 +67,8 @@ const char kOldWidth[] = "oldWidth";
 const char kPartition[] = "partition";
 const char kPersistPrefix[] = "persist:";
 const char kProcessId[] = "processId";
-const char kSrc[] = "src";
 const char kReason[] = "reason";
+const char kSrc[] = "src";
 const char kURL[] = "url";
 
 // Error messages.
@@ -259,6 +260,27 @@ bool BrowserPlugin::DamageBufferMatches(
 }
 #endif
 
+void BrowserPlugin::UpdateDOMAttribute(
+    const std::string& attribute_name,
+    const std::string& attribute_value) {
+  if (!container())
+    return;
+
+  WebKit::WebElement element = container()->element();
+  WebKit::WebString web_attribute_name =
+      WebKit::WebString::fromUTF8(attribute_name);
+  std::string current_value(element.getAttribute(web_attribute_name).utf8());
+  if (current_value == attribute_value)
+    return;
+
+  if (attribute_value.empty()) {
+    element.removeAttribute(web_attribute_name);
+  } else {
+    element.setAttribute(web_attribute_name,
+        WebKit::WebString::fromUTF8(attribute_value));
+  }
+}
+
 void BrowserPlugin::SetMaxHeightAttribute(int max_height) {
   if (max_height_ == max_height)
     return;
@@ -613,8 +635,10 @@ void BrowserPlugin::LoadCommit(
   // If the guest has just committed a new navigation then it is no longer
   // crashed.
   guest_crashed_ = false;
-  if (params.is_top_level)
+  if (params.is_top_level) {
     src_ = params.url.spec();
+    UpdateDOMAttribute(kSrc, src_.c_str());
+  }
   process_id_ = params.process_id;
   current_nav_entry_index_ = params.current_entry_index;
   nav_entry_count_ = params.entry_count;