Add more profile labels for the separate parts of restyle processing. (Bug 790379) rs=cjones

layout/base/nsCSSFrameConstructor.cpp

@@ -119,6 +119,7 @@
 
 #include "nsRefreshDriver.h"
 #include "nsRuleProcessorData.h"
+#include "sampler.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
@@ -8012,6 +8013,8 @@ nsCSSFrameConstructor::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
   if (!count)
     return NS_OK;
 
+  SAMPLE_LABEL("CSS", "ProcessRestyledFrames");
+
   // Make sure to not rebuild quote or counter lists while we're
   // processing restyles
   BeginUpdate();

layout/base/nsFrameManager.cpp

@@ -61,6 +61,7 @@
 
 #include "nsFrameManager.h"
 #include "nsRuleProcessorData.h"
+#include "sampler.h"
 
 #ifdef ACCESSIBILITY
 #include "nsAccessibilityService.h"
@@ -1646,6 +1647,8 @@ nsFrameManager::ComputeStyleChangeFor(nsIFrame          *aFrame,
                                       RestyleTracker&    aRestyleTracker,
                                       bool               aRestyleDescendants)
 {
+  SAMPLE_LABEL("CSS", "ComputeStyleChangeFor");
+
   nsIContent *content = aFrame->GetContent();
   if (aMinChange) {
     aChangeList->AppendChange(aFrame, content, aMinChange);