WIP: Plumbing input event latency reporting through Mus GPU.

ui/events/latency_info.cc

Index: ui/events/latency_info.cc
diff --git a/ui/events/latency_info.cc b/ui/events/latency_info.cc
index 272704b8121b20e461c0b826e16184578c3b60e5..961d1308baa4acd59308500cb55ce3a316c976f5 100644
--- a/ui/events/latency_info.cc
+++ b/ui/events/latency_info.cc
@@ -20,38 +20,6 @@ namespace {
 
 const size_t kMaxLatencyInfoNumber = 100;
 
-const char* GetComponentName(ui::LatencyComponentType type) {
-#define CASE_TYPE(t) case ui::t:  return #t
-  switch (type) {
-    CASE_TYPE(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT);
-    CASE_TYPE(LATENCY_BEGIN_SCROLL_LISTENER_UPDATE_MAIN_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_FIRST_SCROLL_UPDATE_ORIGINAL_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_UI_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_MAIN_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_IMPL_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT);
-    CASE_TYPE(WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT);
-    CASE_TYPE(TAB_SHOW_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERER_MAIN_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL);
-    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_NO_SWAP_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT);
-    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT);
-    default:
-      DLOG(WARNING) << "Unhandled LatencyComponentType.\n";
-      break;
-  }
-#undef CASE_TYPE
-  return "unknown";
-}
 
 bool IsTerminalComponent(ui::LatencyComponentType type) {
   switch (type) {
@@ -130,6 +98,39 @@ static base::LazyInstance<LatencyInfoEnabledInitializer>::Leaky
 
 namespace ui {
 
+const char* GetComponentName(ui::LatencyComponentType type) {
+#define CASE_TYPE(t) case ui::t:  return #t
+  switch (type) {
+    CASE_TYPE(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT);
+    CASE_TYPE(LATENCY_BEGIN_SCROLL_LISTENER_UPDATE_MAIN_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_SCROLL_UPDATE_ORIGINAL_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_FIRST_SCROLL_UPDATE_ORIGINAL_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_UI_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_MAIN_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERING_SCHEDULED_IMPL_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_FORWARD_SCROLL_UPDATE_TO_MAIN_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT);
+    CASE_TYPE(WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT);
+    CASE_TYPE(TAB_SHOW_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERER_MAIN_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_RENDERER_SWAP_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_BROWSER_RECEIVED_RENDERER_SWAP_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL);
+    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_NO_SWAP_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT);
+    CASE_TYPE(INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT);
+    default:
+      DLOG(WARNING) << "Unhandled LatencyComponentType.\n";
+      break;
+  }
+#undef CASE_TYPE
+  return "unknown";
+}
+
 LatencyInfo::LatencyInfo() : LatencyInfo(SourceEventType::UNKNOWN) {}
 
 LatencyInfo::LatencyInfo(SourceEventType type)
@@ -355,6 +356,20 @@ bool LatencyInfo::FindLatency(LatencyComponentType type,
   return true;
 }
 
+bool LatencyInfo::FindLatency(LatencyComponentType type,
+                              LatencyComponent* output) const {
+  LatencyMap::const_iterator it = latency_components_.begin();
+  while (it != latency_components_.end()) {
+    if (it->first.first == type) {
+      if (output)
+        *output = it->second;
+      return true;
+    }
+    it++;
+  }
+  return false;
+}
+
 void LatencyInfo::RemoveLatency(LatencyComponentType type) {
   LatencyMap::iterator it = latency_components_.begin();
   while (it != latency_components_.end()) {