9 files changed, 327 insertions, 6 deletions
diff --git a/content/renderer/devtools/devtools_agent.cc b/content/renderer/devtools/devtools_agent.cc
index 635acc1..cb9aeba 100644
--- a/content/renderer/devtools/devtools_agent.cc
+++ b/content/renderer/devtools/devtools_agent.cc
@@ -22,6 +22,7 @@
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebDevToolsAgent.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebSettings.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 #if defined(USE_TCMALLOC)
@@ -144,6 +145,22 @@ void DevToolsAgent::setTraceEventCallback(TraceEventCallback cb) {
   }
 }
 
+void DevToolsAgent::enableDeviceEmulation(
+    const WebKit::WebSize& device_size,
+    const WebKit::WebRect& view_rect,
+    float device_scale_factor,
+    bool fit_to_view) {
+  RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view());
+  impl->webview()->settings()->setForceCompositingMode(true);
+  impl->EnableScreenMetricsEmulation(gfx::Size(device_size),
+      gfx::Rect(view_rect), device_scale_factor, fit_to_view);
+}
+
+void DevToolsAgent::disableDeviceEmulation() {
+  RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view());
+  impl->DisableScreenMetricsEmulation();
+}
+
 #if defined(USE_TCMALLOC) && !defined(OS_WIN)
 static void AllocationVisitor(void* data, const void* ptr) {
     typedef WebKit::WebDevToolsAgentClient::AllocatedObjectVisitor Visitor;
diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
index 4ac22db..9860ed7 100644
--- a/content/renderer/devtools/devtools_agent.h
+++ b/content/renderer/devtools/devtools_agent.h
@@ -53,6 +53,11 @@ class DevToolsAgent : public RenderViewObserver,
   virtual void clearBrowserCookies();
   virtual void visitAllocatedObjects(AllocatedObjectVisitor* visitor);
   virtual void setTraceEventCallback(TraceEventCallback cb);
+  virtual void enableDeviceEmulation(
+      const WebKit::WebSize& device_size,
+      const WebKit::WebRect& view_rect, float device_scale_factor,
+      bool fit_to_view);
+  virtual void disableDeviceEmulation();
 
   void OnAttach();
   void OnReattach(const std::string& agent_state);
diff --git a/content/renderer/external_popup_menu.cc b/content/renderer/external_popup_menu.cc
index 08d71e9..070ccd3 100644
--- a/content/renderer/external_popup_menu.cc
+++ b/content/renderer/external_popup_menu.cc
@@ -18,12 +18,23 @@ ExternalPopupMenu::ExternalPopupMenu(
     WebKit::WebExternalPopupMenuClient* popup_menu_client)
     : render_view_(render_view),
       popup_menu_info_(popup_menu_info),
-      popup_menu_client_(popup_menu_client) {
+      popup_menu_client_(popup_menu_client),
+      origin_scale_for_emulation_(0) {
+}
+
+void ExternalPopupMenu::SetOriginScaleForEmulation(float scale) {
+  origin_scale_for_emulation_ = scale;
 }
 
 void ExternalPopupMenu::show(const WebKit::WebRect& bounds) {
+  WebKit::WebRect rect = bounds;
+  if (origin_scale_for_emulation_) {
+    rect.x *= origin_scale_for_emulation_;
+    rect.y *= origin_scale_for_emulation_;
+  }
+
   ViewHostMsg_ShowPopup_Params popup_params;
-  popup_params.bounds = bounds;
+  popup_params.bounds = rect;
   popup_params.item_height = popup_menu_info_.itemHeight;
   popup_params.item_font_size = popup_menu_info_.itemFontSize;
   popup_params.selected_item = popup_menu_info_.selectedIndex;
diff --git a/content/renderer/external_popup_menu.h b/content/renderer/external_popup_menu.h
index 729205f..28d65ac 100644
--- a/content/renderer/external_popup_menu.h
+++ b/content/renderer/external_popup_menu.h
@@ -10,6 +10,7 @@
 #include "base/basictypes.h"
 #include "third_party/WebKit/public/web/WebExternalPopupMenu.h"
 #include "third_party/WebKit/public/web/WebPopupMenuInfo.h"
+#include "ui/gfx/point.h"
 
 namespace WebKit {
 class WebExternalPopupMenuClient;
@@ -26,6 +27,8 @@ class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
 
   virtual ~ExternalPopupMenu() {}
 
+  void SetOriginScaleForEmulation(float scale);
+
 #if defined(OS_MACOSX)
   // Called when the user has selected an item. |selected_item| is -1 if the
   // user canceled the popup.
@@ -46,6 +49,10 @@ class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
   WebKit::WebPopupMenuInfo popup_menu_info_;
   WebKit::WebExternalPopupMenuClient* popup_menu_client_;
 
+  // Popups may be displaced when screen metrics emulation is enabled.
+  // This scale is used to properly adjust popup position.
+  float origin_scale_for_emulation_;
+
   DISALLOW_COPY_AND_ASSIGN(ExternalPopupMenu);
 };
 
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 6f4f908..963e30e 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2339,6 +2339,10 @@ WebView* RenderViewImpl::createView(
 WebWidget* RenderViewImpl::createPopupMenu(WebKit::WebPopupType popup_type) {
   RenderWidget* widget =
       RenderWidget::Create(routing_id_, popup_type, screen_info_);
+  if (screen_metrics_emulator_) {
+    widget->SetPopupOriginAdjustmentsForEmulation(
+        screen_metrics_emulator_.get());
+  }
   return widget->webwidget();
 }
 
@@ -2355,6 +2359,10 @@ WebExternalPopupMenu* RenderViewImpl::createExternalPopupMenu(
     return NULL;
   external_popup_menu_.reset(
       new ExternalPopupMenu(this, popup_menu_info, popup_menu_client));
+  if (screen_metrics_emulator_) {
+    SetExternalPopupOriginAdjustmentsForEmulation(
+        external_popup_menu_.get(), screen_metrics_emulator_.get());
+  }
   return external_popup_menu_.get();
 }
 
@@ -2633,6 +2641,7 @@ void RenderViewImpl::showContextMenu(
     params.x = touch_editing_context_menu_location_.x();
     params.y = touch_editing_context_menu_location_.y();
   }
+  OnShowHostContextMenu(&params);
 
   // Plugins, e.g. PDF, don't currently update the render view when their
   // selected text changes, but the context menu params do contain the updated
@@ -6084,6 +6093,14 @@ bool RenderViewImpl::AllowPartialSwap() const {
   return allow_partial_swap_;
 }
 
+void RenderViewImpl::SetScreenMetricsEmulationParameters(
+    float device_scale_factor, float root_layer_scale) {
+  if (webview()) {
+    webview()->setCompositorDeviceScaleFactorOverride(device_scale_factor);
+    webview()->setRootLayerScaleTransform(root_layer_scale);
+  }
+}
+
 bool RenderViewImpl::ScheduleFileChooser(
     const FileChooserParams& params,
     WebFileChooserCompletion* completion) {
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index b7220ea..1dc7e85 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -774,6 +774,8 @@ class CONTENT_EXPORT RenderViewImpl
   explicit RenderViewImpl(RenderViewImplParams* params);
 
   void Initialize(RenderViewImplParams* params);
+  virtual void SetScreenMetricsEmulationParameters(
+      float device_scale_factor, float root_layer_scale) OVERRIDE;
 
   // Do not delete directly.  This class is reference counted.
   virtual ~RenderViewImpl();
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index abb144d..3c64e51 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -26,6 +26,7 @@
 #include "content/common/view_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/cursor_utils.h"
+#include "content/renderer/external_popup_menu.h"
 #include "content/renderer/gpu/compositor_output_surface.h"
 #include "content/renderer/gpu/compositor_software_output_device.h"
 #include "content/renderer/gpu/delegated_compositor_output_surface.h"
@@ -53,7 +54,7 @@
 #include "third_party/WebKit/public/web/WebScreenInfo.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "ui/base/ui_base_switches.h"
-#include "ui/gfx/point.h"
+#include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/skia_util.h"
@@ -80,6 +81,7 @@ using WebKit::WebGestureEvent;
 using WebKit::WebInputEvent;
 using WebKit::WebKeyboardEvent;
 using WebKit::WebMouseEvent;
+using WebKit::WebMouseWheelEvent;
 using WebKit::WebNavigationPolicy;
 using WebKit::WebPagePopup;
 using WebKit::WebPoint;
@@ -187,6 +189,172 @@ ui::TextInputMode ConvertInputMode(
 
 namespace content {
 
+// RenderWidget::ScreenMetricsEmulator ----------------------------------------
+
+class RenderWidget::ScreenMetricsEmulator {
+ public:
+  ScreenMetricsEmulator(
+      RenderWidget* widget,
+      const gfx::Size& device_size,
+      const gfx::Rect& widget_rect,
+      float device_scale_factor,
+      bool fit_to_view);
+  virtual ~ScreenMetricsEmulator();
+
+  float scale() { return scale_; }
+  gfx::Rect widget_rect() const { return widget_rect_; }
+  gfx::Rect original_screen_rect() const { return original_view_screen_rect_; }
+
+  void ChangeEmulationParams(
+      const gfx::Size& device_size,
+      const gfx::Rect& widget_rect,
+      float device_scale_factor,
+      bool fit_to_view);
+
+  // The following methods alter handlers' behavior for messages related to
+  // widget size and position.
+  void OnResizeMessage(const ViewMsg_Resize_Params& params);
+  void OnUpdateScreenRectsMessage(const gfx::Rect& view_screen_rect,
+                                  const gfx::Rect& window_screen_rect);
+  void OnShowContextMenu(ContextMenuParams* params);
+
+ private:
+  void Apply(float overdraw_bottom_height,
+      gfx::Rect resizer_rect, bool is_fullscreen);
+
+  RenderWidget* widget_;
+
+  // Parameters as passed by RenderWidget::EmulateScreenMetrics.
+  gfx::Size device_size_;
+  gfx::Rect widget_rect_;
+  float device_scale_factor_;
+  bool fit_to_view_;
+
+  // The computed scaled used to fit widget into browser window.
+  float scale_;
+
+  // Original values to restore back after emulation ends.
+  gfx::Size original_size_;
+  gfx::Size original_physical_backing_size_;
+  WebKit::WebScreenInfo original_screen_info_;
+  gfx::Rect original_view_screen_rect_;
+  gfx::Rect original_window_screen_rect_;
+};
+
+RenderWidget::ScreenMetricsEmulator::ScreenMetricsEmulator(
+    RenderWidget* widget,
+    const gfx::Size& device_size,
+    const gfx::Rect& widget_rect,
+    float device_scale_factor,
+    bool fit_to_view)
+    : widget_(widget),
+      device_size_(device_size),
+      widget_rect_(widget_rect),
+      device_scale_factor_(device_scale_factor),
+      fit_to_view_(fit_to_view),
+      scale_(1.f) {
+  original_size_ = widget_->size_;
+  original_physical_backing_size_ = widget_->physical_backing_size_;
+  original_screen_info_ = widget_->screen_info_;
+  original_view_screen_rect_ = widget_->view_screen_rect_;
+  original_window_screen_rect_ = widget_->window_screen_rect_;
+  Apply(widget_->overdraw_bottom_height_,
+        widget_->resizer_rect_, widget_->is_fullscreen_);
+}
+
+RenderWidget::ScreenMetricsEmulator::~ScreenMetricsEmulator() {
+  widget_->screen_info_ = original_screen_info_;
+
+  widget_->SetDeviceScaleFactor(original_screen_info_.deviceScaleFactor);
+  widget_->SetScreenMetricsEmulationParameters(0.f, 1.f);
+  widget_->view_screen_rect_ = original_view_screen_rect_;
+  widget_->window_screen_rect_ = original_window_screen_rect_;
+  widget_->Resize(original_size_, original_physical_backing_size_,
+      widget_->overdraw_bottom_height_, widget_->resizer_rect_,
+      widget_->is_fullscreen_, NO_RESIZE_ACK);
+}
+
+void RenderWidget::ScreenMetricsEmulator::ChangeEmulationParams(
+    const gfx::Size& device_size,
+    const gfx::Rect& widget_rect,
+    float device_scale_factor,
+    bool fit_to_view) {
+  device_size_ = device_size;
+  widget_rect_ = widget_rect;
+  device_scale_factor_ = device_scale_factor;
+  fit_to_view_ = fit_to_view;
+  Apply(widget_->overdraw_bottom_height_,
+        widget_->resizer_rect_, widget_->is_fullscreen_);
+}
+
+void RenderWidget::ScreenMetricsEmulator::Apply(
+    float overdraw_bottom_height, gfx::Rect resizer_rect, bool is_fullscreen) {
+  if (fit_to_view_) {
+    DCHECK(!original_size_.IsEmpty());
+    float width_ratio =
+        static_cast<float>(widget_rect_.width()) / original_size_.width();
+    float height_ratio =
+        static_cast<float>(widget_rect_.height()) / original_size_.height();
+    float ratio = std::max(1.0f, std::max(width_ratio, height_ratio));
+    scale_ = 1.f / ratio;
+  } else {
+    scale_ = 1.f;
+  }
+
+  widget_->screen_info_.rect = gfx::Rect(device_size_);
+  widget_->screen_info_.availableRect = gfx::Rect(device_size_);
+  widget_->screen_info_.deviceScaleFactor = device_scale_factor_;
+
+  // Pass two emulation parameters to the blink side:
+  // - we keep the real device scale factor in compositor to produce sharp image
+  //   even when emulating different scale factor;
+  // - in order to fit into view, WebView applies scaling transform to the
+  //   root layer.
+  widget_->SetScreenMetricsEmulationParameters(
+      original_screen_info_.deviceScaleFactor, scale_);
+
+  widget_->SetDeviceScaleFactor(device_scale_factor_);
+  widget_->view_screen_rect_ = widget_rect_;
+  widget_->window_screen_rect_ = widget_->screen_info_.availableRect;
+
+  gfx::Size physical_backing_size = gfx::ToCeiledSize(gfx::ScaleSize(
+      original_size_, original_screen_info_.deviceScaleFactor));
+  widget_->Resize(widget_rect_.size(), physical_backing_size,
+      overdraw_bottom_height, resizer_rect, is_fullscreen, NO_RESIZE_ACK);
+}
+
+void RenderWidget::ScreenMetricsEmulator::OnResizeMessage(
+    const ViewMsg_Resize_Params& params) {
+  bool need_ack = params.new_size != original_size_ &&
+      !params.new_size.IsEmpty() && !params.physical_backing_size.IsEmpty();
+  original_size_ = params.new_size;
+  original_physical_backing_size_ = params.physical_backing_size;
+  original_screen_info_ = params.screen_info;
+  Apply(params.overdraw_bottom_height, params.resizer_rect,
+        params.is_fullscreen);
+
+  if (need_ack) {
+    widget_->set_next_paint_is_resize_ack();
+    if (widget_->compositor_)
+      widget_->compositor_->SetNeedsRedrawRect(gfx::Rect(widget_->size_));
+  }
+}
+
+void RenderWidget::ScreenMetricsEmulator::OnUpdateScreenRectsMessage(
+    const gfx::Rect& view_screen_rect,
+    const gfx::Rect& window_screen_rect) {
+  original_view_screen_rect_ = view_screen_rect;
+  original_window_screen_rect_ = window_screen_rect;
+}
+
+void RenderWidget::ScreenMetricsEmulator::OnShowContextMenu(
+    ContextMenuParams* params) {
+  params->x *= scale_;
+  params->y *= scale_;
+}
+
+// RenderWidget ---------------------------------------------------------------
+
 RenderWidget::RenderWidget(WebKit::WebPopupType popup_type,
                            const WebKit::WebScreenInfo& screen_info,
                            bool swapped_out,
@@ -232,6 +400,7 @@ RenderWidget::RenderWidget(WebKit::WebPopupType popup_type,
 #if defined(OS_ANDROID)
       outstanding_ime_acks_(0),
 #endif
+      popup_origin_scale_for_emulation_(0.f),
       weak_ptr_factory_(this) {
   if (!swapped_out)
     RenderProcess::current()->AddRefProcess();
@@ -370,6 +539,48 @@ bool RenderWidget::UsingSynchronousRendererCompositor() const {
 #endif
 }
 
+void RenderWidget::EnableScreenMetricsEmulation(
+    const gfx::Size& device_size,
+    const gfx::Rect& widget_rect,
+    float device_scale_factor,
+    bool fit_to_view) {
+  if (!screen_metrics_emulator_) {
+    screen_metrics_emulator_.reset(new ScreenMetricsEmulator(this,
+        device_size, widget_rect, device_scale_factor, fit_to_view));
+  } else {
+    screen_metrics_emulator_->ChangeEmulationParams(device_size,
+        widget_rect, device_scale_factor, fit_to_view);
+  }
+}
+
+void RenderWidget::DisableScreenMetricsEmulation() {
+  screen_metrics_emulator_.reset();
+}
+
+void RenderWidget::SetPopupOriginAdjustmentsForEmulation(
+    ScreenMetricsEmulator* emulator) {
+  popup_origin_scale_for_emulation_ = emulator->scale();
+  popup_view_origin_for_emulation_ = emulator->widget_rect().origin();
+  popup_screen_origin_for_emulation_ =
+      emulator->original_screen_rect().origin();
+}
+
+void RenderWidget::SetScreenMetricsEmulationParameters(
+    float device_scale_factor, float root_layer_scale) {
+  // This is only supported in RenderView.
+  NOTREACHED();
+}
+
+void RenderWidget::SetExternalPopupOriginAdjustmentsForEmulation(
+    ExternalPopupMenu* popup, ScreenMetricsEmulator* emulator) {
+  popup->SetOriginScaleForEmulation(emulator->scale());
+}
+
+void RenderWidget::OnShowHostContextMenu(ContextMenuParams* params) {
+  if (screen_metrics_emulator_)
+    screen_metrics_emulator_->OnShowContextMenu(params);
+}
+
 bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
@@ -532,6 +743,11 @@ void RenderWidget::OnCreatingNewAck() {
 }
 
 void RenderWidget::OnResize(const ViewMsg_Resize_Params& params) {
+  if (screen_metrics_emulator_) {
+    screen_metrics_emulator_->OnResizeMessage(params);
+    return;
+  }
+
   screen_info_ = params.screen_info;
   SetDeviceScaleFactor(screen_info_.deviceScaleFactor);
   Resize(params.new_size, params.physical_backing_size,
@@ -1791,7 +2007,16 @@ void RenderWidget::setToolTipText(const WebKit::WebString& text,
   Send(new ViewHostMsg_SetTooltipText(routing_id_, text, hint));
 }
 
-void RenderWidget::setWindowRect(const WebRect& pos) {
+void RenderWidget::setWindowRect(const WebRect& rect) {
+  WebRect pos = rect;
+  if (popup_origin_scale_for_emulation_) {
+    float scale = popup_origin_scale_for_emulation_;
+    pos.x = popup_screen_origin_for_emulation_.x() +
+        (pos.x - popup_view_origin_for_emulation_.x()) * scale;
+    pos.y = popup_screen_origin_for_emulation_.y() +
+        (pos.y - popup_view_origin_for_emulation_.y()) * scale;
+  }
+
   if (did_show_) {
     if (!RenderThreadImpl::current()->layout_test_mode()) {
       Send(new ViewHostMsg_RequestMove(routing_id_, pos));
@@ -2032,8 +2257,13 @@ void RenderWidget::OnSetTextDirection(WebTextDirection direction) {
 
 void RenderWidget::OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
                                        const gfx::Rect& window_screen_rect) {
-  view_screen_rect_ = view_screen_rect;
-  window_screen_rect_ = window_screen_rect;
+  if (screen_metrics_emulator_) {
+    screen_metrics_emulator_->OnUpdateScreenRectsMessage(
+        view_screen_rect, window_screen_rect);
+  } else {
+    view_screen_rect_ = view_screen_rect;
+    window_screen_rect_ = window_screen_rect;
+  }
   Send(new ViewHostMsg_UpdateScreenRects_ACK(routing_id()));
 }
 
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 0d606f8..dbab733 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -65,9 +65,11 @@ class Range;
 }
 
 namespace content {
+class ExternalPopupMenu;
 class PepperPluginInstanceImpl;
 class RenderWidgetCompositor;
 class RenderWidgetTest;
+struct ContextMenuParams;
 struct GpuRenderingStats;
 struct WebPluginGeometry;
 
@@ -223,6 +225,22 @@ class CONTENT_EXPORT RenderWidget
 
   bool is_swapped_out() { return is_swapped_out_; }
 
+  // ScreenMetricsEmulator class manages screen emulation inside a render
+  // widget. This includes resizing, placing view on the screen at desired
+  // position, changing device scale factor, and scaling down the whole
+  // widget if required to fit into the browser window.
+  class ScreenMetricsEmulator;
+
+  // Emulates screen and widget metrics. Supplied values override everything
+  // coming from host.
+  void EnableScreenMetricsEmulation(
+      const gfx::Size& device_size,
+      const gfx::Rect& widget_rect,
+      float device_scale_factor,
+      bool fit_to_view);
+  void DisableScreenMetricsEmulation();
+  void SetPopupOriginAdjustmentsForEmulation(ScreenMetricsEmulator* emulator);
+
  protected:
   // Friend RefCounted so that the dtor can be non-public. Using this class
   // without ref-counting is an error.
@@ -291,6 +309,11 @@ class CONTENT_EXPORT RenderWidget
               const gfx::Rect& resizer_rect,
               bool is_fullscreen,
               ResizeAck resize_ack);
+  virtual void SetScreenMetricsEmulationParameters(
+      float device_scale_factor, float root_layer_scale);
+  void SetExternalPopupOriginAdjustmentsForEmulation(
+      ExternalPopupMenu* popup, ScreenMetricsEmulator* emulator);
+  virtual void OnShowHostContextMenu(ContextMenuParams* params);
 
   // RenderWidget IPC message handlers
   void OnHandleInputEvent(const WebKit::WebInputEvent* event,
@@ -752,6 +775,14 @@ class CONTENT_EXPORT RenderWidget
   int outstanding_ime_acks_;
 #endif
 
+  scoped_ptr<ScreenMetricsEmulator> screen_metrics_emulator_;
+
+  // Popups may be displaced when screen metrics emulation is enabled.
+  // These values are used to properly adjust popup position.
+  gfx::Point popup_view_origin_for_emulation_;
+  gfx::Point popup_screen_origin_for_emulation_;
+  float popup_origin_scale_for_emulation_;
+
   base::WeakPtrFactory<RenderWidget> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
diff --git a/content/renderer/web_preferences.cc b/content/renderer/web_preferences.cc
index a7df752..f558189 100644
--- a/content/renderer/web_preferences.cc
+++ b/content/renderer/web_preferences.cc
@@ -348,6 +348,7 @@ void ApplyWebPreferences(const WebPreferences& prefs, WebView* web_view) {
       prefs.viewport_meta_zero_values_quirk);
   settings->setIgnoreMainFrameOverflowHiddenQuirk(
       prefs.ignore_main_frame_overflow_hidden_quirk);
+  settings->setMainFrameClipsContent(false);
 #endif
 
   WebNetworkStateNotifier::setOnLine(prefs.is_online);