Specify a default display UI scale to reset the zoom to

ui/display/manager/managed_display_info.cc

 // Copyright (c) 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.
 
 #include "ui/display/manager/managed_display_info.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 61 matching lines @@
 
   bool is_internal;
 };
 
 }  // namespace
 
 ManagedDisplayMode::ManagedDisplayMode()
     : refresh_rate_(0.0f),
       is_interlaced_(false),
       native_(false),
+      is_default_(false),

[oshima, 2016/10/19 21:04:06]

just initialize it in line because it's always false.

[afakhry, 2016/10/24 20:21:46]

Done.

       ui_scale_(1.0f),
       device_scale_factor_(1.0f) {}
 
 ManagedDisplayMode::ManagedDisplayMode(const gfx::Size& size)
     : size_(size),
       refresh_rate_(0.0f),
       is_interlaced_(false),
       native_(false),
+      is_default_(false),
       ui_scale_(1.0f),
       device_scale_factor_(1.0f) {}
 
 ManagedDisplayMode::ManagedDisplayMode(const gfx::Size& size,
                                        float refresh_rate,
                                        bool is_interlaced,
                                        bool native)
     : size_(size),
       refresh_rate_(refresh_rate),
       is_interlaced_(is_interlaced),
       native_(native),
+      is_default_(false),
       ui_scale_(1.0f),
       device_scale_factor_(1.0f) {}
 
 ManagedDisplayMode::~ManagedDisplayMode(){};
 
 ManagedDisplayMode::ManagedDisplayMode(const gfx::Size& size,
                                        float refresh_rate,
                                        bool is_interlaced,
                                        bool native,
                                        float ui_scale,
                                        float device_scale_factor)
     : size_(size),
       refresh_rate_(refresh_rate),
       is_interlaced_(is_interlaced),
       native_(native),
+      is_default_(false),
       ui_scale_(ui_scale),
       device_scale_factor_(device_scale_factor) {}
 
 gfx::Size ManagedDisplayMode::GetSizeInDIP(bool is_internal) const {
   gfx::SizeF size_dip(size_);
   size_dip.Scale(ui_scale_);
   // DSF=1.25 is special on internal display. The screen is drawn with DSF=1.25
   // but it doesn't affect the screen size computation.
   if (use_125_dsf_for_ui_scaling && is_internal &&
       device_scale_factor_ == 1.25f)
@@ skipping 368 matching lines @@
 
 void ManagedDisplayInfo::ClearInputDevices() {
   input_devices_.clear();
 }
 
 void ResetDisplayIdForTest() {
   synthesized_display_id = kSynthesizedDisplayIdStart;
 }
 
 }  // namespace display