Fixed the Touchscreen.TouchEventsEnabled histogram to record the correct values on X11 and Ozone ba…

ui/gfx/test/test_screen.h

 // Copyright 2015 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 UI_MOJO_INIT_SCREEN_MOJO_H_
-#define UI_MOJO_INIT_SCREEN_MOJO_H_
+#include <vector>
 
+#include "base/macros.h"
 #include "ui/gfx/display.h"
-#include "ui/gfx/geometry/size.h"
 #include "ui/gfx/screen.h"
 
-namespace ui {
-namespace mojo {
+namespace gfx {
+namespace test {
 
-class ScreenMojo : public gfx::Screen {
+// A dummy implementation of gfx::Screen that contains a single gfx::Display
+// only. The contained gfx::Display can be accessed and modified via
+// TestScreen::display().
+//
+// NOTE: Adding and removing gfx::DisplayOberver's are no-ops and observers will
+// NOT be notified ever.
+class TestScreen : public gfx::Screen {
  public:
-  ScreenMojo(const gfx::Size& screen_size_in_pixels, float device_pixel_ratio);
+  TestScreen();
+  ~TestScreen() override;
+
+  gfx::Display* display() { return &display_; }
 
   // gfx::Screen:
   gfx::Point GetCursorScreenPoint() override;
   gfx::NativeWindow GetWindowUnderCursor() override;
   gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
-  gfx::Display GetPrimaryDisplay() const override;
+  int GetNumDisplays() const override;
+  std::vector<gfx::Display> GetAllDisplays() const override;
   gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
   gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override;
-  int GetNumDisplays() const override;
-  std::vector<gfx::Display> GetAllDisplays() const override;
   gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override;
+  gfx::Display GetPrimaryDisplay() const override;
   void AddObserver(gfx::DisplayObserver* observer) override;
   void RemoveObserver(gfx::DisplayObserver* observer) override;
 
  private:
-  const gfx::Size screen_size_in_pixels_;
-  const float device_pixel_ratio_;
-
+  // The only display.
   gfx::Display display_;
 
-  DISALLOW_COPY_AND_ASSIGN(ScreenMojo);
+  DISALLOW_COPY_AND_ASSIGN(TestScreen);
 };
 
-}  // namespace mojo
-}  // namespace ui
-
-#endif  // UI_MOJO_INIT_SCREEN_MOJO_H_
+}  // namespace test
+}  // namespace gfx