Re-land "Issue 191223007: Move touch CTM from X into Chrome"

ash/touch/touch_transformer_controller.h

Index: ash/touch/touch_transformer_controller.h
diff --git a/ash/touch/touch_transformer_controller.h b/ash/touch/touch_transformer_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..f06be2957e1ac43faee9bdc74c15241fb01e4ca4
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+++ b/ash/touch/touch_transformer_controller.h
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+// 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.
+
+#ifndef ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_
+#define ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_
+
+#include "ash/ash_export.h"
+#include "ash/display/display_controller.h"
+#include "ui/gfx/transform.h"
+
+namespace ash {
+
+// TouchTransformerController listens to display configuration change
+// and updates the touch transformation for touch displays.
+class ASH_EXPORT TouchTransformerController
+    : public DisplayController::Observer {
+ public:
+  TouchTransformerController();
+  virtual ~TouchTransformerController();
+
+  // Updates the TouchTransformer for touch device and pushes the new
+  // TouchTransformer into device manager.
+  void UpdateTouchTransformer() const;
+
+  // DisplayController::Observer:
+  virtual void OnDisplaysInitialized() OVERRIDE;
+  virtual void OnDisplayConfigurationChanged() OVERRIDE;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
+                           TouchTransformerMirrorModeLetterboxing);
+  FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
+                           TouchTransformerMirrorModePillarboxing);
+  FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
+                           TouchTransformerExtendedMode);
+
+  bool ShouldComputeMirrorModeTouchTransformer(
+      const DisplayInfo& touch_display) const ;
+
+  gfx::Transform GetMirrorModeTouchTransformer(
+      const DisplayInfo& touch_display) const;
+
+  gfx::Transform GetExtendedModeTouchTransformer(
+      const DisplayInfo& touch_display, const gfx::Size& fb_size) const;
+
+  // For unittests only.
+  bool force_compute_mirror_mode_touch_transformer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchTransformerController);
+};
+
+}  // namespace ash
+
+#endif  // ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_