Add shortcut keys to ui scaling

ui/aura/root_window.cc

 // Copyright (c) 2012 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 "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 18 matching lines @@
 #include "ui/base/gestures/gesture_types.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/view_prop.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/point3_f.h"
 #include "ui/gfx/point_conversions.h"
-#include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/screen.h"
+#include "ui/gfx/size_conversions.h"
 
 using std::vector;
 
 namespace aura {
 
 namespace {
 
 const char kRootWindowForAcceleratedWidget[] =
     "__AURA_ROOT_WINDOW_ACCELERATED_WIDGET__";
 
@@ skipping 701 matching lines @@
     CleanupGestureRecognizerState(*iter);
   }
 }
 
 void RootWindow::UpdateWindowSize(const gfx::Size& host_size) {
   gfx::Rect bounds(host_size);
   bounds.Inset(host_->GetInsets());
   bounds = ui::ConvertRectToDIP(layer(), bounds);
   gfx::RectF new_bounds(bounds);
   layer()->transform().TransformRect(&new_bounds);
-
   // It makes little sense to scale beyond the original
   // resolution.
   DCHECK_LE(root_window_scale_, GetDeviceScaleFactor());
   // Apply |root_window_scale_| twice as the downscaling
   // is already applied once in |SetTransformInternal()|.
   // TODO(oshima): This is a bit ugly. Consider specifying
   // the pseudo host resolution instead.
   new_bounds.Scale(root_window_scale_ * root_window_scale_);
   // Ignore the origin because RootWindow's insets are handled by
   // the transform.
-  SetBounds(gfx::Rect(gfx::ToNearestRect(new_bounds).size()));
+  // Round the size because the bounds is no longer aligned to
+  // backing pixel when |root_window_scale_| is specified
+  // (850 height at 1.25 scale becomes 1062.5 for example.)
+  SetBounds(gfx::Rect(gfx::ToRoundedSize(new_bounds.size())));
 }
 
 void RootWindow::OnWindowAddedToRootWindow(Window* attached) {
   if (attached->IsVisible() &&
       attached->ContainsPointInRoot(GetLastMouseLocationInRoot()))
     PostMouseMoveEventAfterWindowChange();
 }
 
 bool RootWindow::CanDispatchToTarget(ui::EventTarget* target) {
   return event_dispatch_target_ == target;
@@ skipping 304 matching lines @@
   // currently broken. See/ crbug.com/107931.
   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
                        orig_mouse_location,
                        orig_mouse_location,
                        ui::EF_IS_SYNTHESIZED);
   event.set_system_location(Env::GetInstance()->last_mouse_location());
   OnHostMouseEvent(&event);
 }
 
 }  // namespace aura