<webview>: First stab at implementing media permission request for guests.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index d470801eb6667279c79734097e1488e0357222c4..e4ae58d345127fea7d72300f798d341d0b3a80b3 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -20,6 +20,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/resource_request_details.h"
 #include "content/public/browser/user_metrics.h"
+#include "content/public/common/media_stream_request.h"
 #include "content/public/common/result_codes.h"
 #include "content/browser/browser_plugin/browser_plugin_host_factory.h"
 #include "net/base/net_errors.h"
@@ -131,6 +132,20 @@ void BrowserPluginGuest::RendererUnresponsive(WebContents* source) {
   RecordAction(UserMetricsAction("BrowserPlugin.Guest.Hung"));
 }
 
+void BrowserPluginGuest::RequestMediaAccessPermission(
+    WebContents* web_contents,
+    const content::MediaStreamRequest* request,
+    const content::MediaResponseCallback& callback) {
+  static int request_count = 0;
+  int request_id = request_count++;
+  media_requests_map_.insert(
+      std::make_pair(request_id,
+                     std::make_pair(*request, callback)));
+
+  SendMessageToEmbedder(new BrowserPluginMsg_RequestMediaAccess(instance_id(),
+                                                                request_id));
+}
+
 void BrowserPluginGuest::SetIsAcceptingTouchEvents(bool accept) {
   SendMessageToEmbedder(
       new BrowserPluginMsg_ShouldAcceptTouchEvents(instance_id(), accept));
@@ -155,6 +170,33 @@ void BrowserPluginGuest::Terminate() {
   base::KillProcess(process_handle, RESULT_CODE_KILLED, false);
 }
 
+void BrowserPluginGuest::AllowMediaAccess(WebContents* embedder_web_contents,
+                                          int request_id,
+                                          bool allow) {
+  MediaStreamRequestsMap::iterator media_request_iter =
+      media_requests_map_.find(request_id);
+  if (media_request_iter == media_requests_map_.end()) {
+    LOG(INFO) << "Not a valid request id";
+    return;
+  }
+  const content::MediaStreamRequest& request = media_request_iter->second.first;
+  const content::MediaResponseCallback& callback =
+      media_request_iter->second.second;
+
+  if (allow) {
+    WebContentsImpl* embedder_web_contents_impl = static_cast<
+        WebContentsImpl*>(embedder_web_contents);
+    // Re-route the request to the embedder's WebContents, the guest gets the
+    // permission this way.
+    embedder_web_contents_impl->RequestMediaAccessPermission(
+        &request, callback);
+  } else {
+    // Deny the request.
+    callback.Run(content::MediaStreamDevices());
+  }
+  media_requests_map_.erase(media_request_iter);
+}
+
 void BrowserPluginGuest::SetDamageBuffer(
     TransportDIB* damage_buffer,
 #if defined(OS_WIN)