Add ash devtools client

ash/common/devtools/devtools_client_backend.h

Index: ash/common/devtools/devtools_client_backend.h
diff --git a/ash/common/devtools/devtools_client_backend.h b/ash/common/devtools/devtools_client_backend.h
new file mode 100644
index 0000000000000000000000000000000000000000..2ae98307032ddf272d0f97e10c195acdc38678a4
--- /dev/null
+++ b/ash/common/devtools/devtools_client_backend.h
@@ -0,0 +1,29 @@
+// Copyright 2016 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.
+

[sadrul, 2016/10/17 16:18:59]

Add include guard

[Sarmad Hashmi, 2016/10/17 19:11:48]

Done.

+#include "ash/common/wm_shell.h"
+#include "ui/devtools/DOM.h"
+
+namespace ui {
+namespace devtools {
+
+class AshDevToolsBackend : public protocol::DOM::Backend {
+ public:
+  AshDevToolsBackend(ash::WmShell* shell);

[sadrul, 2016/10/17 16:18:59]

explicit

[Sarmad Hashmi, 2016/10/17 19:11:48]

Done.

+  ~AshDevToolsBackend() override;
+
+ private:
+  std::unique_ptr<protocol::DOM::Node> buildInitialTree();

[sadrul, 2016/10/17 16:18:59]

BuildInitialTree()

[Sarmad Hashmi, 2016/10/17 19:11:48]

Done.

+
+  // DOM::Backend
+  void enable(protocol::ErrorString* error) override {}
+  void disable(protocol::ErrorString* error) override {}

[sadrul, 2016/10/17 16:18:59]

When are enable/disable called?

[Sarmad Hashmi, 2016/10/17 19:11:48]

The client (inspector) sends an enable message initially and it won't request
anything else (such as getDocument) until the Backend responds to that enable
request. Disable is for, as you can probably guess, disabling the inspector
tabs.

+  void getDocument(protocol::ErrorString* error,
+                   std::unique_ptr<protocol::DOM::Node>* out_root) override;
+
+  ash::WmShell* shell_;
+};

[sadrul, 2016/10/17 16:18:59]

DISALLOW_COPY_AND_ASSIGN

[Sarmad Hashmi, 2016/10/17 19:11:48]

Done.

+
+}  // namespace devtools
+}  // namespace ui