Centralize ScreenOrientationProvider logic, add platform delegates

content/public/browser/screen_orientation_provider.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/public/browser/screen_orientation_provider.h"
+
+#include "content/public/browser/screen_orientation_provider_factory.h"
+
+namespace content {
+
+ScreenOrientationProviderFactory* ScreenOrientationProvider::factory_ = NULL;
+
+ScreenOrientationProvider*
+    ScreenOrientationProvider::ScreenOrientationProvider::Create(

[mlamouri (slow - plz ping), 2014/09/16 20:21:04]

isn't there one ScreenOrientationProvider too many?

[jonross, 2014/09/16 21:48:13]

Yeah... not sure why it didn't complain

+        ScreenOrientationDispatcherHost* dispatcher_host,
+        WebContents* web_contents) {
+  if (factory_)
+    return factory_->Create(dispatcher_host, web_contents);
+  return NULL;

[mlamouri (slow - plz ping), 2014/09/16 20:21:04]

nit: I would do:
if (!factory_)
  return NULL;
return factory_->Create(...);

[jonross, 2014/09/16 21:48:13]

Done.

+}
+
+void ScreenOrientationProvider::SetFactory(
+    ScreenOrientationProviderFactory* factory) {
+  factory_ = factory;
+}
+
+} // namespace content