Add Tracing.requestMemoryDump method to DevTools API (tracing handler)

content/browser/devtools/protocol/tracing_handler.cc

Index: content/browser/devtools/protocol/tracing_handler.cc
diff --git a/content/browser/devtools/protocol/tracing_handler.cc b/content/browser/devtools/protocol/tracing_handler.cc
index d3611b352c36b19a049eb67c24ee025fe9fe1812..66f54d21de2b8fdaf523f92f73f28fbebd2b845e 100644
--- a/content/browser/devtools/protocol/tracing_handler.cc
+++ b/content/browser/devtools/protocol/tracing_handler.cc
@@ -7,10 +7,12 @@
 #include <cmath>
 
 #include "base/bind.h"
+#include "base/format_macros.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event_impl.h"
 
 namespace content {
@@ -154,7 +156,24 @@ void TracingHandler::OnCategoriesReceived(
 }
 
 Response TracingHandler::RequestMemoryDump(DevToolsCommandId command_id) {
-  return Response::InternalError("Not implemented");
+  if (!did_initiate_recording_)
+    return Response::InternalError("Tracing is not started");
+
+  base::trace_event::MemoryDumpManager::GetInstance()->RequestGlobalDump(
+      base::trace_event::MemoryDumpType::EXPLICITLY_TRIGGERED,
+      base::Bind(&TracingHandler::OnMemoryDumpFinished,
+                 weak_factory_.GetWeakPtr(), command_id));
+  return Response::OK();
+}
+
+void TracingHandler::OnMemoryDumpFinished(DevToolsCommandId command_id,
+                                          uint64 dump_guid,
+                                          bool success) {
+  client_->SendRequestMemoryDumpResponse(
+      command_id,
+      RequestMemoryDumpResponse::Create()
+          ->set_dump_guid(base::StringPrintf("0x%" PRIx64, dump_guid))
+          ->set_success(success));
 }
 
 void TracingHandler::SetupTimer(double usage_reporting_interval) {