Support JavaScript window.moveTo/By() and resizeTo/By() (fixes #698)

Adds new CefDisplayHandler::OnContentsBoundsChange and
CefDisplayHandler::GetRootWindowScreenRect callbacks.

cefclient: Implement the above callbacks and call
CefBrowserHost::NotifyScreenInfoChanged when the root window
bounds change.

cefclient: osr: Use real screen bounds by default. Pass
`--fake-screen-bounds` for the old default behavior.

Load https://tests/window in cefclient for additional
implementation details and usage examples.

libcef/browser/native/browser_platform_delegate_native_aura.h

@@ -5,19 +5,19 @@
 #ifndef CEF_LIBCEF_BROWSER_NATIVE_BROWSER_PLATFORM_DELEGATE_NATIVE_AURA_H_
 #define CEF_LIBCEF_BROWSER_NATIVE_BROWSER_PLATFORM_DELEGATE_NATIVE_AURA_H_
 
+#include <optional>
+
 #include "base/memory/raw_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "cef/libcef/browser/native/browser_platform_delegate_native.h"
 #include "ui/events/event.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/vector2d.h"
 
 namespace content {
 class RenderWidgetHostViewAura;
 }
 
-namespace gfx {
-class Vector2d;
-}
-
 // Windowed browser implementation for Aura platforms.
 class CefBrowserPlatformDelegateNativeAura
     : public CefBrowserPlatformDelegateNative {
@@ -25,7 +25,10 @@ class CefBrowserPlatformDelegateNativeAura
   CefBrowserPlatformDelegateNativeAura(const CefWindowInfo& window_info,
                                        SkColor background_color);
 
+  void InstallRootWindowBoundsCallback();
+
   // CefBrowserPlatformDelegate methods:
+  void RenderViewReady() override;
   void SendKeyEvent(const CefKeyEvent& event) override;
   void SendMouseClickEvent(const CefMouseEvent& event,
                            CefBrowserHost::MouseButtonType type,
@@ -71,9 +74,16 @@ class CefBrowserPlatformDelegateNativeAura
       int deltaY) const;
   virtual gfx::Vector2d GetUiWheelEventOffset(int deltaX, int deltaY) const;
 
+  // Returns the root window bounds in screen DIP coordinates.
+  virtual std::optional<gfx::Rect> GetRootWindowBounds() {
+    return std::nullopt;
+  }
+
  protected:
   base::OnceClosure GetWidgetDeleteCallback();
 
+  std::optional<gfx::Rect> RootWindowBoundsCallback();
+
   static base::TimeTicks GetEventTimeStamp();
   static int TranslateUiEventModifiers(uint32_t cef_modifiers);
   static int TranslateUiChangedButtonFlags(uint32_t cef_modifiers);