Mojo-ify implementation of screen orientation locking/unlocking.

content/renderer/screen_orientation/screen_orientation_dispatcher.cc

 // Copyright 2014 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 "content/renderer/screen_orientation/screen_orientation_dispatcher.h"
 
-#include "content/common/screen_orientation_messages.h"
+#include "content/public/common/associated_interface_provider.h"
+#include "content/public/renderer/render_frame.h"
 
 namespace content {
 
+using ::blink::mojom::ScreenOrientationLockResult;
+
 ScreenOrientationDispatcher::ScreenOrientationDispatcher(
     RenderFrame* render_frame)
     : RenderFrameObserver(render_frame) {
 }
 
 ScreenOrientationDispatcher::~ScreenOrientationDispatcher() {
 }
 
-bool ScreenOrientationDispatcher::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-
-  IPC_BEGIN_MESSAGE_MAP(ScreenOrientationDispatcher, message)
-    IPC_MESSAGE_HANDLER(ScreenOrientationMsg_LockSuccess,
-                        OnLockSuccess)
-    IPC_MESSAGE_HANDLER(ScreenOrientationMsg_LockError,
-                        OnLockError)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-
-  return handled;
-}
-
 void ScreenOrientationDispatcher::OnDestruct() {
   delete this;
 }
 
-void ScreenOrientationDispatcher::OnLockSuccess(int request_id) {
+void ScreenOrientationDispatcher::OnLockOrientationResult(
+    int request_id,
+    ScreenOrientationLockResult result) {
   blink::WebLockOrientationCallback* callback =
       pending_callbacks_.Lookup(request_id);
   if (!callback)
     return;
-  callback->onSuccess();
+
+  switch (result) {
+    case ScreenOrientationLockResult::SCREEN_ORIENTATION_LOCK_RESULT_SUCCESS:
+      callback->onSuccess();
+      break;
+    case ScreenOrientationLockResult::
+        SCREEN_ORIENTATION_LOCK_RESULT_ERROR_NOT_AVAILABLE:
+      callback->onError(blink::WebLockOrientationErrorNotAvailable);
+      break;
+    case ScreenOrientationLockResult::
+        SCREEN_ORIENTATION_LOCK_RESULT_ERROR_FULLSCREEN_REQUIRED:
+      callback->onError(blink::WebLockOrientationErrorFullscreenRequired);
+      break;
+    case ScreenOrientationLockResult::
+        SCREEN_ORIENTATION_LOCK_RESULT_ERROR_CANCELED:
+      callback->onError(blink::WebLockOrientationErrorCanceled);
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+
   pending_callbacks_.Remove(request_id);
 }
 
-void ScreenOrientationDispatcher::OnLockError(
-    int request_id, blink::WebLockOrientationError error) {
-  blink::WebLockOrientationCallback* callback =
-      pending_callbacks_.Lookup(request_id);
-  if (!callback)
-    return;
-  callback->onError(error);
-  pending_callbacks_.Remove(request_id);
-}
-
 void ScreenOrientationDispatcher::CancelPendingLocks() {
   for (CallbackMap::Iterator<blink::WebLockOrientationCallback>
        iterator(&pending_callbacks_); !iterator.IsAtEnd(); iterator.Advance()) {
     iterator.GetCurrentValue()->onError(blink::WebLockOrientationErrorCanceled);
     pending_callbacks_.Remove(iterator.GetCurrentKey());
   }
 }
 
 void ScreenOrientationDispatcher::lockOrientation(
     blink::WebScreenOrientationLockType orientation,
     blink::WebLockOrientationCallback* callback) {
   CancelPendingLocks();
 
   int request_id = pending_callbacks_.Add(callback);
-  Send(new ScreenOrientationHostMsg_LockRequest(
-      routing_id(), orientation, request_id));
+  SetScreenOrientationInterface();

[mlamouri (slow - plz ping), 2016/11/13 00:26:36]

Maybe "EnsureScreenOrientationService" would be a better name?

Alternatively:
```
GetScreenOrientationService()->LockOrientation(orientation, base::bind(...));
```

[lunalu1, 2016/11/16 18:46:58]

Done.

+  screen_orientation_->LockOrientation(
+      orientation,
+      base::Bind(&ScreenOrientationDispatcher::OnLockOrientationResult,
+                 base::Unretained(this), request_id));
 }
 
 void ScreenOrientationDispatcher::unlockOrientation() {
   CancelPendingLocks();
-  Send(new ScreenOrientationHostMsg_Unlock(routing_id()));
+  SetScreenOrientationInterface();
+  screen_orientation_->UnlockOrientation();
+}
+
+void ScreenOrientationDispatcher::SetScreenOrientationInterface() {
+  if (!screen_orientation_)

[mlamouri (slow - plz ping), 2016/11/13 00:26:36]

style: add { }

[lunalu1, 2016/11/16 18:46:58]

Done.

+    render_frame()->GetRemoteAssociatedInterfaces()->GetInterface(
+        &screen_orientation_);
+}
+
+int ScreenOrientationDispatcher::GetRequestIdForTests() {
+  if (pending_callbacks_.IsEmpty())
+    return -1;
+  CallbackMap::Iterator<blink::WebLockOrientationCallback> iterator(
+      &pending_callbacks_);
+  return iterator.GetCurrentKey();
 }
 
 }  // namespace content