Allow virtual keyboard window to access audio stream and speech api for voice input

ui/keyboard/keyboard_controller_proxy.cc

Index: ui/keyboard/keyboard_controller_proxy.cc
diff --git a/ui/keyboard/keyboard_controller_proxy.cc b/ui/keyboard/keyboard_controller_proxy.cc
index be490055b90b50206fc39d2c03565885356fd1ac..0df627302324a9680414a646b9a4e5c171975cc5 100644
--- a/ui/keyboard/keyboard_controller_proxy.cc
+++ b/ui/keyboard/keyboard_controller_proxy.cc
@@ -37,6 +37,23 @@ class KeyboardContentsDelegate : public content::WebContentsDelegate,
     delete this;
   }
 
+  virtual void RequestMediaAccessPermission(
+    content::WebContents* web_contents,
+    const content::MediaStreamRequest& request,
+    const content::MediaResponseCallback& callback) OVERRIDE {

[sadrul, 2013/05/14 05:13:03]

I took a brief look at the code in ProcessMediaAccessRequest, and
WebContentsImpl::RequestMediaAccessPermission. It doesn't look like there is a
good way of doing all of the work from here without duplicating a lot of code
from browser/media/.

We don't want to move the entire KeyboardContentsDelegate into chrome. An
alternate solution for this would be to introduce
KeyboardControllerProxy::RequestAudioInput (or something like that). The chrome
implementation (in AshKeyboardControllerProxy) would interact with
MediaCaptureDevicesDispatcher. Note that the implementation should just accept
the request, without showing an infobar to the user. The default implementation
can deny the request.

KeyboardContentsDelegate should have a reference to the KCP, and call into its
RequestAudioInput from here.

+    const extensions::Extension* extension = NULL;
+    GURL origin(request.security_origin);
+    if (origin.SchemeIs(extensions::kExtensionScheme)) {
+      ExtensionService* extensions_service =
+          extensions::ExtensionSystem::Get(profile_)->extension_service();
+      extension = extensions_service->extensions()->GetByID(origin.host());
+      DCHECK(extension);
+    }
+
+    MediaCaptureDevicesDispatcher::GetInstance()->ProcessMediaAccessRequest(
+        web_contents, request, callback, extension);
+  }
+
   DISALLOW_COPY_AND_ASSIGN(KeyboardContentsDelegate);
 };