Adds link disambiguation popup support to Windows.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index a59880e6a98cec1506666c278943ce2fdaa17069..6ad6e41e96a7d8afbffd6b5508e44bf0edcc79a7 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -29,6 +29,7 @@
 #include "content/browser/renderer_host/input/synthetic_gesture_target_aura.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
+#include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/ui_events_helper.h"
@@ -1231,6 +1232,89 @@ gfx::GLSurfaceHandle RenderWidgetHostViewAura::GetCompositingSurface() {
   return ImageTransportFactory::GetInstance()->GetSharedSurfaceHandle();
 }
 
+void RenderWidgetHostViewAura::ShowDisambiguationPopup(
+    const gfx::Rect& rect_pixels,
+    const SkBitmap& zoomed_bitmap) {
+  // |target_rect| is provided in pixels, not DIPs. So we convert it to DIPs
+  // by scaling it by the inverse of the device scale factor.
+  gfx::RectF screen_target_rect_f(rect_pixels);
+  screen_target_rect_f.Scale(1.0f / current_device_scale_factor_);
+  disambiguation_target_rect_ = gfx::ToEnclosingRect(screen_target_rect_f);
+
+  float scale = static_cast<float>(zoomed_bitmap.width()) /
+                static_cast<float>(rect_pixels.width());
+  gfx::Size zoomed_size(gfx::ToCeiledSize(
+      gfx::ScaleSize(disambiguation_target_rect_.size(), scale)));
+
+  // Save of a copy of the |last_scroll_offset_| for comparison when the copy
+  // callback fires, to ensure that we haven't scrolled.
+  disambiguation_scroll_offset_ = last_scroll_offset_;
+
+  CopyFromCompositingSurface(
+      disambiguation_target_rect_,
+      zoomed_size,
+      base::Bind(&RenderWidgetHostViewAura::DisambiguationPopupRendered,
+          base::internal::SupportsWeakPtrBase::StaticAsWeakPtr
+              <RenderWidgetHostViewAura>(this)),
+      kN32_SkColorType);
+}
+
+void RenderWidgetHostViewAura::DisambiguationPopupRendered(
+    bool success,
+    const SkBitmap& result) {
+  if (!success || disambiguation_scroll_offset_ != last_scroll_offset_)
+    return;
+
+  // Use RenderViewHostDelegate to get to the WebContentsViewAura, which will
+  // actually show the delegate.
+  RenderViewHostDelegate* delegate = NULL;
+  if (host_->IsRenderView())
+    delegate = RenderViewHost::From(host_)->GetDelegate();
+  RenderViewHostDelegateView* delegate_view = NULL;
+  if (delegate)
+    delegate_view = delegate->GetDelegateView();
+  if (delegate_view) {
+    delegate_view->ShowDisambiguationPopup(
+        disambiguation_target_rect_,
+        result,
+        base::Bind(&RenderWidgetHostViewAura::ProcessDisambiguationGesture,
+            base::internal::SupportsWeakPtrBase::StaticAsWeakPtr
+                <RenderWidgetHostViewAura>(this)),
+        base::Bind(&RenderWidgetHostViewAura::ProcessDisambiguationMouse,
+            base::internal::SupportsWeakPtrBase::StaticAsWeakPtr
+                <RenderWidgetHostViewAura>(this)));
+  }
+}
+
+void RenderWidgetHostViewAura::HideDisambiguationPopup() {
+  RenderViewHostDelegate* delegate = NULL;
+  if (host_->IsRenderView())
+    delegate = RenderViewHost::From(host_)->GetDelegate();
+  RenderViewHostDelegateView* delegate_view = NULL;
+  if (delegate)
+    delegate_view = delegate->GetDelegateView();
+  if (delegate_view)
+    delegate_view->HideDisambiguationPopup();
+}
+
+void RenderWidgetHostViewAura::ProcessDisambiguationGesture(
+    ui::GestureEvent* event) {
+  blink::WebGestureEvent web_gesture = content::MakeWebGestureEvent(event);
+  // If we fail to make a WebGestureEvent that is a Tap from the provided event,
+  // don't forward it to Blink.
+  if (web_gesture.type < blink::WebInputEvent::Type::GestureTap ||
+      web_gesture.type > blink::WebInputEvent::Type::GestureTapCancel)
+    return;
+
+  host_->ForwardGestureEvent(web_gesture);
+}
+
+void RenderWidgetHostViewAura::ProcessDisambiguationMouse(
+    ui::MouseEvent* event) {
+  blink::WebMouseEvent web_mouse = content::MakeWebMouseEvent(event);
+  host_->ForwardMouseEvent(web_mouse);
+}
+
 bool RenderWidgetHostViewAura::LockMouse() {
   aura::Window* root_window = window_->GetRootWindow();
   if (!root_window)
@@ -1847,6 +1931,10 @@ void RenderWidgetHostViewAura::OnMouseEvent(ui::MouseEvent* event) {
                         reinterpret_cast<LPARAM>(toplevel_hwnd));
     }
 #endif
+    // The Disambiguation popup does not parent itself from this window, so we
+    // manually dismiss it.
+    HideDisambiguationPopup();
+
     blink::WebMouseWheelEvent mouse_wheel_event =
         MakeWebMouseWheelEvent(static_cast<ui::MouseWheelEvent*>(event));
     if (mouse_wheel_event.deltaX != 0 || mouse_wheel_event.deltaY != 0)