Add an histogram to differentiate between hang types of the renderer

content/browser/renderer_host/render_widget_host_unittest.cc

Index: content/browser/renderer_host/render_widget_host_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_unittest.cc b/content/browser/renderer_host/render_widget_host_unittest.cc
index 54d11f4497210c0a173bae3a9fdc857502a21d14..b83c7e27cab137550e08e6e6c9672be978169905 100644
--- a/content/browser/renderer_host/render_widget_host_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_unittest.cc
@@ -406,7 +406,8 @@ class MockRenderWidgetHostDelegate : public RenderWidgetHostDelegate {
     return handle_wheel_event_;
   }
 
-  void RendererUnresponsive(RenderWidgetHostImpl* render_widget_host) override {
+  void RendererUnresponsive(RenderWidgetHostImpl* render_widget_host,
+                            RendererUnresponsiveType type) override {
     unresponsive_timer_fired_ = true;
   }
 
@@ -1071,11 +1072,15 @@ TEST_F(RenderWidgetHostTest, UnhandledGestureEvent) {
 // while one is in progress (see crbug.com/11007).
 TEST_F(RenderWidgetHostTest, DontPostponeHangMonitorTimeout) {
   // Start with a short timeout.
-  host_->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(10));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromMilliseconds(10),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
 
   // Immediately try to add a long 30 second timeout.
   EXPECT_FALSE(delegate_->unresponsive_timer_fired());
-  host_->StartHangMonitorTimeout(TimeDelta::FromSeconds(30));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromSeconds(30),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
 
   // Wait long enough for first timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
@@ -1089,12 +1094,16 @@ TEST_F(RenderWidgetHostTest, DontPostponeHangMonitorTimeout) {
 // and then started again.
 TEST_F(RenderWidgetHostTest, StopAndStartHangMonitorTimeout) {
   // Start with a short timeout, then stop it.
-  host_->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(10));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromMilliseconds(10),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
   host_->StopHangMonitorTimeout();
 
   // Start it again to ensure it still works.
   EXPECT_FALSE(delegate_->unresponsive_timer_fired());
-  host_->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(10));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromMilliseconds(10),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
 
   // Wait long enough for first timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
@@ -1108,11 +1117,15 @@ TEST_F(RenderWidgetHostTest, StopAndStartHangMonitorTimeout) {
 // updated to a shorter duration.
 TEST_F(RenderWidgetHostTest, ShorterDelayHangMonitorTimeout) {
   // Start with a timeout.
-  host_->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(100));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromMilliseconds(100),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
 
   // Start it again with shorter delay.
   EXPECT_FALSE(delegate_->unresponsive_timer_fired());
-  host_->StartHangMonitorTimeout(TimeDelta::FromMilliseconds(20));
+  host_->StartHangMonitorTimeout(
+      TimeDelta::FromMilliseconds(20),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
 
   // Wait long enough for the second timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(