Clear page display after navigation if no rendered output arrives

content/browser/renderer_host/render_widget_host_unittest.cc

 // Copyright (c) 2012 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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
@@ skipping 121 matching lines @@
   MockRenderWidgetHost(RenderWidgetHostDelegate* delegate,
                        RenderProcessHost* process,
                        int routing_id)
       : RenderWidgetHostImpl(
             delegate,
             process,
             routing_id,
             GpuSurfaceTracker::Get()->AddSurfaceForRenderer(process->GetID(),
                                                             routing_id),
             false),
-        unresponsive_timer_fired_(false) {
+        unresponsive_timer_fired_(false),
+        new_content_rendering_timeout_fired_(false) {
     acked_touch_event_type_ = blink::WebInputEvent::Undefined;
   }
 
   // Allow poking at a few private members.
   using RenderWidgetHostImpl::GetResizeParams;
   using RenderWidgetHostImpl::OnUpdateRect;
   using RenderWidgetHostImpl::RendererExited;
   using RenderWidgetHostImpl::SetInitialRenderSizeParams;
   using RenderWidgetHostImpl::old_resize_params_;
   using RenderWidgetHostImpl::is_hidden_;
   using RenderWidgetHostImpl::resize_ack_pending_;
   using RenderWidgetHostImpl::input_router_;
 
   void OnTouchEventAck(const TouchEventWithLatencyInfo& event,
                        InputEventAckState ack_result) override {
     // Sniff touch acks.
     acked_touch_event_type_ = event.event.type;
     RenderWidgetHostImpl::OnTouchEventAck(event, ack_result);
   }
 
   bool unresponsive_timer_fired() const {
     return unresponsive_timer_fired_;
   }
 
+  bool new_content_rendering_timeout_fired() const {
+    return new_content_rendering_timeout_fired_;
+  }
+
   void DisableGestureDebounce() {
     input_router_.reset(new InputRouterImpl(
         process_, this, this, routing_id_, InputRouterImpl::Config()));
   }
 
   WebInputEvent::Type acked_touch_event_type() const {
     return acked_touch_event_type_;
   }
 
   void SetupForInputRouterTest() {
     input_router_.reset(new MockInputRouter(this));
   }
 
   MockInputRouter* mock_input_router() {
     return static_cast<MockInputRouter*>(input_router_.get());
   }
 
  protected:
   void NotifyRendererUnresponsive() override {
     unresponsive_timer_fired_ = true;
   }
 
+  void NotifyNewContentRenderingTimeoutForTesting() override {
+    new_content_rendering_timeout_fired_ = true;
+  }
+
   bool unresponsive_timer_fired_;
+  bool new_content_rendering_timeout_fired_;
   WebInputEvent::Type acked_touch_event_type_;
 
   DISALLOW_COPY_AND_ASSIGN(MockRenderWidgetHost);
 };
 
 namespace  {
 
 // RenderWidgetHostProcess -----------------------------------------------------
 
 class RenderWidgetHostProcess : public MockRenderProcessHost {
@@ skipping 885 matching lines @@
                     INPUT_EVENT_ACK_STATE_CONSUMED);
 
   // Wait long enough for first timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::MessageLoop::QuitClosure(),
       TimeDelta::FromMicroseconds(20));
   base::MessageLoop::current()->Run();
   EXPECT_TRUE(host_->unresponsive_timer_fired());
 }
 
+// Test that the rendering timeout for newly loaded content fires
+// when enough time passes without receiving a new compositor frame.
+TEST_F(RenderWidgetHostTest, NewContentRenderingTimeout) {
+  host_->set_new_content_rendering_delay_for_testing(
+      base::TimeDelta::FromMicroseconds(10));
+
+  // Test immediate start and stop, ensuring that the timeout doesn't fire.
+  host_->StartNewContentRenderingTimeout();
+  host_->StopNewContentRenderingTimeout();
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::MessageLoop::QuitClosure(),
+      TimeDelta::FromMicroseconds(20));
+  base::MessageLoop::current()->Run();
+
+  EXPECT_FALSE(host_->new_content_rendering_timeout_fired());
+
+  // Test with a long delay to ensure that it does fire this time.
+  host_->StartNewContentRenderingTimeout();
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::MessageLoop::QuitClosure(),
+      TimeDelta::FromMicroseconds(20));
+  base::MessageLoop::current()->Run();
+  EXPECT_TRUE(host_->new_content_rendering_timeout_fired());
+}
+
 std::string GetInputMessageTypes(RenderWidgetHostProcess* process) {
   std::string result;
   for (size_t i = 0; i < process->sink().message_count(); ++i) {
     const IPC::Message *message = process->sink().GetMessageAt(i);
     EXPECT_EQ(InputMsg_HandleInputEvent::ID, message->type());
     InputMsg_HandleInputEvent::Param params;
     EXPECT_TRUE(InputMsg_HandleInputEvent::Read(message, &params));
     const WebInputEvent* event = base::get<0>(params);
     if (i != 0)
       result += " ";
@@ skipping 443 matching lines @@
   // Having an initial size set means that the size information had been sent
   // with the reqiest to new up the RenderView and so subsequent WasResized
   // calls should not result in new IPC (unless the size has actually changed).
   host_->WasResized();
   EXPECT_FALSE(process_->sink().GetUniqueMessageMatching(ViewMsg_Resize::ID));
   EXPECT_EQ(initial_size_, host_->old_resize_params_->new_size);
   EXPECT_TRUE(host_->resize_ack_pending_);
 }
 
 }  // namespace content