Adding MimeHandlerView.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index c49da3c3b6f7019c901da3b18b7da5b7c6d87969..9346a06f2f6ae792b83fce61e5a4ce00cf81fb6a 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -515,7 +515,9 @@ bool ChromeContentRendererClient::OverrideCreatePlugin(
     content::RenderFrame* render_frame,
     WebLocalFrame* frame,
     const WebPluginParams& params,
+    int* instance_id,
     WebPlugin** plugin) {
+  *instance_id = -1;  // kInstanceIDNone.
   std::string orig_mime_type = params.mimeType.utf8();
   if (orig_mime_type == content::kBrowserPluginMimeType) {
     WebDocument document = frame->document();
@@ -539,8 +541,11 @@ bool ChromeContentRendererClient::OverrideCreatePlugin(
       render_frame->GetRoutingID(), GURL(params.url),
       frame->top()->document().url(), orig_mime_type, &output));
 
-  if (output.plugin.type == content::WebPluginInfo::PLUGIN_TYPE_BROWSER_PLUGIN)
+  if (output.plugin.type ==
+          content::WebPluginInfo::PLUGIN_TYPE_BROWSER_PLUGIN) {
+    *instance_id = output.instance_id;
     return false;
+  }
 #else
   output.status.value = ChromeViewHostMsg_GetPluginInfo_Status::kNotFound;
 #endif