Implement Device Orientation using shared memory in content/renderer.

content/browser/renderer_host/device_orientation_browser_message_filter.h

Index: content/browser/renderer_host/device_orientation_browser_message_filter.h
diff --git a/content/browser/renderer_host/device_orientation_browser_message_filter.h b/content/browser/renderer_host/device_orientation_browser_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..575219a356c20812b08b1b4657e5ba0ec3fc8d0e
--- /dev/null
+++ b/content/browser/renderer_host/device_orientation_browser_message_filter.h
@@ -0,0 +1,39 @@
+ // Copyright 2013 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.
+
+ #ifndef CONTENT_BROWSER_RENDERER_HOST_DEVICE_ORIENTATION_BROWSER_MESSAGE_FILTER_H_
+ #define CONTENT_BROWSER_RENDERER_HOST_DEVICE_ORIENTATION_BROWSER_MESSAGE_FILTER_H_

[darin (slow to review), 2013/07/31 19:27:28]

is there a reason why this file doesn't exist in
content/browser/device_orientation/ alongside the related code?  note how
resource_message_filter.{h,cc} live in content/browser/loader/.

[timvolodine, 2013/08/01 15:31:36]

AFAIK there is no reason, so moved it there.
I needed to resolve some naming conflicts though because of the old
implementation.
(+looks like gamepad_browser_message_filter.{h,cc} also needs to move to
browser/gamepad)

+
+ #include "base/compiler_specific.h"
+ #include "base/memory/shared_memory.h"

[darin (slow to review), 2013/07/31 19:27:28]

nit: looks like this include is not needed

[timvolodine, 2013/08/01 15:31:36]

Done.

+ #include "content/public/browser/browser_message_filter.h"
+
+ namespace content {
+
+ class DeviceMotionService;
+ class RenderProcessHost;
+
+ class DeviceOrientationBrowserMessageFilter : public BrowserMessageFilter {

[darin (slow to review), 2013/07/31 19:27:28]

I think this class should be named DeviceOrientationMessageFilter.  You can drop
the Browser word.  See other BrowserMessageFilter subclasses for reference.

[timvolodine, 2013/08/01 15:31:36]

Done.

+  public:
+   DeviceOrientationBrowserMessageFilter();
+
+   // BrowserMessageFilter implementation.
+   virtual bool OnMessageReceived(const IPC::Message& message,
+                                  bool* message_was_ok) OVERRIDE;
+
+  private:
+   virtual ~DeviceOrientationBrowserMessageFilter();
+
+   void OnDeviceOrientationStartPolling();
+   void OnDeviceOrientationStopPolling();
+   void DidStartDeviceOrientationPolling();
+
+   bool is_started_;
+
+   DISALLOW_COPY_AND_ASSIGN(DeviceOrientationBrowserMessageFilter);
+ };
+
+ }  // namespace content
+
+ #endif  // CONTENT_BROWSER_RENDERER_HOST_DEVICE_ORIENTATION_BROWSER_MESSAGE_FILTER_H_