RemoteMacViews: Make window resize smooth

Use the RenderWidgetResizeHelper's task runner to handle the mojo
messages to and from the BridgedNativeWidget and
BridgedNativeWidgetHost.

Bug: 859152
Change-Id: I3d9fab6cd81edafd74e45d06c658d1bd15e1fde4
Reviewed-on: https://chromium-review.googlesource.com/1244103
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594134}

ui/views/cocoa/bridged_native_widget.mm

@@ -16,6 +16,7 @@
 #include "base/no_destructor.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/sys_string_conversions.h"
+#include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #import "ui/base/cocoa/constrained_window/constrained_window_animation.h"
 #import "ui/base/cocoa/window_size_constants.h"
@@ -295,7 +296,8 @@ BridgedNativeWidgetImpl::~BridgedNativeWidgetImpl() {
 
 void BridgedNativeWidgetImpl::BindRequest(
     views_bridge_mac::mojom::BridgedNativeWidgetRequest request) {
-  bridge_mojo_binding_.Bind(std::move(request));
+  bridge_mojo_binding_.Bind(std::move(request),
+                            ui::WindowResizeHelperMac::Get()->task_runner());
 }
 
 void BridgedNativeWidgetImpl::SetWindow(

ui/views/cocoa/bridged_native_widget_host_impl.mm

@@ -5,6 +5,7 @@
 #include "ui/views/cocoa/bridged_native_widget_host_impl.h"
 
 #include "base/mac/foundation_util.h"
+#include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
@@ -145,7 +146,8 @@ void BridgedNativeWidgetHostImpl::CreateRemoteBridge(
 
   // Initialize |bridge_ptr_| to point to a bridge created by |factory|.
   views_bridge_mac::mojom::BridgedNativeWidgetHostPtr host_ptr;
-  host_mojo_binding_.Bind(mojo::MakeRequest(&host_ptr));
+  host_mojo_binding_.Bind(mojo::MakeRequest(&host_ptr),
+                          ui::WindowResizeHelperMac::Get()->task_runner());
   bridge_factory_host_->GetFactory()->CreateBridge(
       id_, mojo::MakeRequest(&bridge_ptr_), std::move(host_ptr));