Add DeviceDisplayInfo getter in WindowAndroid.

ui/android/screen_android.cc

+// Copyright 2016 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 "base/logging.h"
+#include "base/macros.h"
+#include "ui/android/screen_android.h"
+#include "ui/android/view_android.h"
+#include "ui/android/window_android.h"
+#include "ui/gfx/android/device_display_info.h"
+#include "ui/gfx/display.h"
+
+namespace ui {
+
+namespace {
+
+gfx::Display DisplayFromDeviceDisplayInfo(
+    const gfx::DeviceDisplayInfo& device_info) {
+  const float device_scale_factor = device_info.GetDIPScale();
+  // Note: GetPhysicalDisplayWidth/Height() does not subtract window
+  // decorations etc. Use it instead of GetDisplayWidth/Height() when
+  // available.
+  const gfx::Rect bounds_in_pixels =
+      gfx::Rect(device_info.GetPhysicalDisplayWidth()
+                    ? device_info.GetPhysicalDisplayWidth()
+                    : device_info.GetDisplayWidth(),
+                device_info.GetPhysicalDisplayHeight()
+                    ? device_info.GetPhysicalDisplayHeight()
+                    : device_info.GetDisplayHeight());
+  const gfx::Rect bounds_in_dip = gfx::Rect(gfx::ScaleToCeiledSize(
+      bounds_in_pixels.size(), 1.0f / device_scale_factor));
+  gfx::Display display(0, bounds_in_dip);
+  if (!gfx::Display::HasForceDeviceScaleFactor())
+    display.set_device_scale_factor(device_scale_factor);
+  display.SetRotationAsDegree(device_info.GetRotationDegrees());
+  return display;
+}
+
+}  // namespace
+
+class ScreenAndroid : public gfx::Screen {
+ public:
+  ScreenAndroid() {}
+
+  gfx::Point GetCursorScreenPoint() override { return gfx::Point(); }
+
+  gfx::NativeWindow GetWindowUnderCursor() override {
+    NOTIMPLEMENTED();
+    return nullptr;
+  }
+
+  gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
+    NOTIMPLEMENTED();
+    return nullptr;
+  }
+
+  gfx::Display GetPrimaryDisplay() const override {
+    gfx::DeviceDisplayInfo device_info;
+    return DisplayFromDeviceDisplayInfo(device_info);
+  }
+
+  gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override {
+    if (view) {
+      return DisplayFromDeviceDisplayInfo(
+          view->GetWindowAndroid()->GetDeviceDisplayInfo());
+    }
+    return GetPrimaryDisplay();
+  }
+
+  gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override {
+    NOTIMPLEMENTED();
+    return gfx::Display();
+  }
+
+  int GetNumDisplays() const override { return 1; }
+
+  std::vector<gfx::Display> GetAllDisplays() const override {
+    NOTIMPLEMENTED();
+    return std::vector<gfx::Display>(1, GetPrimaryDisplay());
+  }
+
+  gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
+    NOTIMPLEMENTED();
+    return gfx::Display();
+  }
+
+  void AddObserver(gfx::DisplayObserver* observer) override {
+    // no display change on Android.
+  }
+
+  void RemoveObserver(gfx::DisplayObserver* observer) override {
+    // no display change on Android.
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ScreenAndroid);
+};
+
+gfx::Screen* CreateScreenAndroid() {
+  return new ScreenAndroid;
+}
+
+}  // namespace ui