Add support for tracking loading behavior of child frames.

third_party/WebKit/Source/core/loader/DocumentLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index 5942857618fb997cc9ea613711629bb74c3bd32d..6a730cede93276c95c2c009ad3418136cbc80e14 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -239,14 +239,14 @@ void DocumentLoader::dispatchLinkHeaderPreloads(
 }
 
 void DocumentLoader::didChangePerformanceTiming() {
-  if (m_frame && m_frame->isMainFrame() && m_state >= Committed) {
+  if (m_frame && m_state >= Committed) {
     localFrameClient().didChangePerformanceTiming();
   }
 }
 
 void DocumentLoader::didObserveLoadingBehavior(
     WebLoadingBehaviorFlag behavior) {
-  if (m_frame && m_frame->isMainFrame()) {
+  if (m_frame) {
     DCHECK_GE(m_state, Committed);
     localFrameClient().didObserveLoadingBehavior(behavior);
   }