Collect tab timing information for use in telementry-based startup tests

content/common/child_process_messages.h

Index: content/common/child_process_messages.h
diff --git a/content/common/child_process_messages.h b/content/common/child_process_messages.h
index 4e3c8c771e02037c8d5c8914ed1995153ea5b28f..fa3357d048132271644a5bd1a4d22320db835b80 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -12,11 +12,17 @@
 #include "base/tracked_objects.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
+#include "content/common/tab_load_stats.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
 
 IPC_ENUM_TRAITS(tracked_objects::ThreadData::Status)
 
+IPC_STRUCT_TRAITS_BEGIN(content::TabLoadTime)
+  IPC_STRUCT_TRAITS_MEMBER(start_time)
+  IPC_STRUCT_TRAITS_MEMBER(stop_time)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(tracked_objects::LocationSnapshot)
   IPC_STRUCT_TRAITS_MEMBER(file_name)
   IPC_STRUCT_TRAITS_MEMBER(function_name)
@@ -110,11 +116,17 @@ IPC_MESSAGE_CONTROL2(ChildProcessHostMsg_ChildHistogramData,
 
 // Request a histogram from the browser. The browser will send the histogram
 // data only if it has been passed the command line flag
-// switches::kDomAutomationController.
+// switches::kStatsCollectionExtension.
 IPC_SYNC_MESSAGE_CONTROL1_1(ChildProcessHostMsg_GetBrowserHistogram,
                             std::string, /* histogram_name */
                             std::string /* histogram_json */)
 
+// Get timing data for a given tab.
+IPC_SYNC_MESSAGE_CONTROL1_2(ChildProcessHostMsg_GetTabLoadTimingInformation,
+                            int, /* routing_id */
+                            content::TabLoadTime, /* tab_timing_data */
+                            base::TimeTicks /* timer_start */)
+
 // Reply to ChildProcessMsg_DumpHandles when handle table dump is complete.
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_DumpHandlesDone)