Plumb through useUnfortunateSynchronousResizeMode.

This is a second side of Blink's r160382. It adds capability
to switch between normal resizing and the synchronous (the unfortunate) one.

BUG=309760
R=jam, jochen

Review URL: https://codereview.chromium.org/38463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230881 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/content/renderer/resizing_mode_selector.h b/content/renderer/resizing_mode_selector.h
new file mode 100644
index 0000000..67702fd
--- /dev/null
+++ b/content/renderer/resizing_mode_selector.h
@@ -0,0 +1,43 @@
+// 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_RENDERER_RESIZING_MODE_SELECTOR_H_
+#define CONTENT_RENDERER_RESIZING_MODE_SELECTOR_H_
+
+#include "base/basictypes.h"
+
+struct ViewMsg_Resize_Params;
+
+namespace content {
+
+class RenderWidget;
+
+// Enables switching between two modes of resizing:
+// 1) The "normal" (asynchronous) resizing, which involves sending messages to
+//    and receiving them from host; and
+// 2) The synchronous mode, which short-circuits the resizing logic to operate
+//    strictly inside renderer.
+// The latter is necessary to support a handful of layout tests that were
+// written with the expectation of a synchronous resize, and we're going to
+// eventually rewrite or remove all of them. See http://crbug.com/309760 for
+// details.
+class ResizingModeSelector {
+ public:
+  ResizingModeSelector();
+
+  bool ShouldAbortOnResize(RenderWidget* widget,
+                           const ViewMsg_Resize_Params& params);
+
+  void set_is_synchronous_mode(bool mode);
+  bool is_synchronous_mode() const;
+
+ private:
+  bool is_synchronous_mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResizingModeSelector);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_RESIZING_MODE_SELECTOR_H_