headless: make initial screen/window sizes configurable.

headless/lib/browser/headless_screen.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 "headless/lib/browser/headless_screen.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "ui/aura/env.h"
@@ skipping 12 matching lines @@
 
 bool IsRotationPortrait(display::Display::Rotation rotation) {
   return rotation == display::Display::ROTATE_90 ||
          rotation == display::Display::ROTATE_270;
 }
 
 }  // namespace
 
 // static
 HeadlessScreen* HeadlessScreen::Create(const gfx::Size& size) {
-  const gfx::Size kDefaultSize(800, 600);
-  return new HeadlessScreen(gfx::Rect(size.IsEmpty() ? kDefaultSize : size));
+  return new HeadlessScreen(gfx::Rect(size));
 }
 
 HeadlessScreen::~HeadlessScreen() {}
 
 aura::WindowTreeHost* HeadlessScreen::CreateHostForPrimaryDisplay() {
   DCHECK(!host_);
   host_ = aura::WindowTreeHost::Create(gfx::Rect(display_.GetSizeInPixel()));
   // Some tests don't correctly manage window focus/activation states.
   // Makes sure InputMethod is default focused so that IME basics can work.
   host_->GetInputMethod()->OnFocus();
@@ skipping 120 matching lines @@
 void HeadlessScreen::RemoveObserver(display::DisplayObserver* observer) {}
 
 HeadlessScreen::HeadlessScreen(const gfx::Rect& screen_bounds)
     : host_(NULL), ui_scale_(1.0f) {
   static int64_t synthesized_display_id = 2000;
   display_.set_id(synthesized_display_id++);
   display_.SetScaleAndBounds(1.0f, screen_bounds);
 }
 
 }  // namespace headless