Ensure RemoteViewportIntersection rect persists across frame navigations

content/browser/frame_host/render_widget_host_view_child_frame_unittest.cc

 // Copyright 2014 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 "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 35 matching lines @@
  public:
   MockRenderWidgetHostDelegate() {}
   ~MockRenderWidgetHostDelegate() override {}
  private:
   void Cut() override {}
   void Copy() override {}
   void Paste() override {}
   void SelectAll() override {}
 };
 
+}  // namespace
+
 class MockCrossProcessFrameConnector : public CrossProcessFrameConnector {
  public:
   MockCrossProcessFrameConnector() : CrossProcessFrameConnector(nullptr) {}
   ~MockCrossProcessFrameConnector() override {}
 
   void SetChildFrameSurface(const cc::SurfaceInfo& surface_info,
                             const cc::SurfaceSequence& sequence) override {
     last_surface_info_ = surface_info;
   }
 
+  void SetViewportIntersection(const gfx::Rect& intersection) {
+    viewport_intersection_rect_ = intersection;
+  }
+
   RenderWidgetHostViewBase* GetParentRenderWidgetHostView() override {
     return nullptr;
   }
 
   cc::SurfaceInfo last_surface_info_;
 };
 
-}  // namespace
-
 class RenderWidgetHostViewChildFrameTest : public testing::Test {
  public:
   RenderWidgetHostViewChildFrameTest()
       : scoped_task_environment_(
             base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
 
   void SetUp() override {
     browser_context_.reset(new TestBrowserContext);
 
 // ImageTransportFactory doesn't exist on Android.
@@ skipping 197 matching lines @@
 
     // Explicit ack through OnDidNotProduceFrame is forwarded.
     cc::BeginFrameAck ack(source_id, 6, 4, false);
     view_->OnDidNotProduceFrame(ack);
     EXPECT_EQ(ack, source.LastAckForObserver(view_->support_.get()));
   }
 
   view_->SetNeedsBeginFrames(false);
 }
 
+// Tests that the viewport intersection rect is dispatched to the RenderWidget
+// whenever screen rects are updated.
+TEST_F(RenderWidgetHostViewChildFrameTest, ViewportIntersectionUpdated) {
+  gfx::Rect intersection_rect(5, 5, 100, 80);
+  test_frame_connector_->SetViewportIntersection(intersection_rect);
+
+  MockRenderProcessHost* process =
+      static_cast<MockRenderProcessHost*>(widget_host_->GetProcess());
+  process->Init();
+
+  widget_host_->Init();
+
+  const IPC::Message* intersection_update =
+      process->sink().GetUniqueMessageMatching(
+          ViewMsg_SetViewportIntersection::ID);
+  ASSERT_TRUE(intersection_update);
+  std::tuple<gfx::Rect> sent_rect;
+  ViewMsg_SetViewportIntersection::Read(intersection_update, &sent_rect);
+  EXPECT_EQ(intersection_rect, std::get<0>(sent_rect));
+}
+
 }  // namespace content