add classes trace_analyzer::Query and TraceAnalyzer to make it easy to search through trace data

base/debug/trace_event.cc

Index: base/debug/trace_event.cc
diff --git a/base/debug/trace_event.cc b/base/debug/trace_event.cc
index 879f3a978f9361900a8658b61c4ead4ef5f75f0b..978da685961338ebce3e57224c72220306374510 100644
--- a/base/debug/trace_event.cc
+++ b/base/debug/trace_event.cc
@@ -110,22 +110,6 @@ void TraceValue::AppendAsJSON(std::string* out) const {
 
 namespace {
 
-const char* GetPhaseStr(TraceEventPhase phase) {
-  switch(phase) {
-    case TRACE_EVENT_PHASE_BEGIN:
-      return "B";
-    case TRACE_EVENT_PHASE_INSTANT:
-      return "I";
-    case TRACE_EVENT_PHASE_END:
-      return "E";
-    case TRACE_EVENT_PHASE_METADATA:
-      return "M";
-    default:
-      NOTREACHED() << "Invalid phase argument";
-      return "?";
-  }
-}
-
 size_t GetAllocLength(const char* str) { return str ? strlen(str) + 1 : 0; }
 
 // Copies |*member| into |*buffer|, sets |*member| to point to this new
@@ -212,6 +196,37 @@ TraceEvent::TraceEvent(unsigned long process_id,
 TraceEvent::~TraceEvent() {
 }
 
+const char* TraceEvent::GetPhaseStr(TraceEventPhase phase) {
+  switch(phase) {
+    case TRACE_EVENT_PHASE_BEGIN:
+      return "B";
+    case TRACE_EVENT_PHASE_INSTANT:
+      return "I";
+    case TRACE_EVENT_PHASE_END:
+      return "E";
+    case TRACE_EVENT_PHASE_METADATA:
+      return "M";
+    default:
+      NOTREACHED() << "Invalid phase argument";
+      return "?";
+  }
+}
+
+TraceEventPhase TraceEvent::GetPhase(const char* phase) {
+  switch(*phase) {
+    case 'B':
+      return TRACE_EVENT_PHASE_BEGIN;
+    case 'I':
+      return TRACE_EVENT_PHASE_INSTANT;
+    case 'E':
+      return TRACE_EVENT_PHASE_END;
+    case 'M':
+      return TRACE_EVENT_PHASE_METADATA;
+    default:
+      return TRACE_EVENT_PHASE_METADATA;

[nduca, 2011/10/11 20:33:37]

is this right? 'X'->metdata? X->UNKNOWN and DCHECK(false)??

[jbates, 2011/10/12 22:35:20]

Done.

+  }
+}
+
 void TraceEvent::AppendEventsAsJSON(const std::vector<TraceEvent>& events,
                                     size_t start,
                                     size_t count,