DevTools: Profiler domain refactoring: encode timestamps as deltas.

third_party/WebKit/Source/platform/v8_inspector/V8ProfilerAgentImpl.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/v8_inspector/V8ProfilerAgentImpl.h"
 
 #include "platform/v8_inspector/Atomics.h"
 #include "platform/v8_inspector/V8InspectorImpl.h"
 #include "platform/v8_inspector/V8InspectorSessionImpl.h"
 #include "platform/v8_inspector/V8StackTraceImpl.h"
@@ skipping 66 matching lines @@
 
 std::unique_ptr<protocol::Array<int>> buildInspectorObjectForSamples(v8::CpuProfile* v8profile)
 {
     std::unique_ptr<protocol::Array<int>> array = protocol::Array<int>::create();
     int count = v8profile->GetSamplesCount();
     for (int i = 0; i < count; i++)
         array->addItem(v8profile->GetSample(i)->GetNodeId());
     return array;
 }
 
-std::unique_ptr<protocol::Array<double>> buildInspectorObjectForTimestamps(v8::CpuProfile* v8profile)
+std::unique_ptr<protocol::Array<int>> buildInspectorObjectForTimestamps(v8::CpuProfile* v8profile)
 {
-    std::unique_ptr<protocol::Array<double>> array = protocol::Array<double>::create();
+    std::unique_ptr<protocol::Array<int>> array = protocol::Array<int>::create();
     int count = v8profile->GetSamplesCount();
-    for (int i = 0; i < count; i++)
-        array->addItem(v8profile->GetSampleTimestamp(i));
+    uint64_t lastTime = v8profile->GetStartTime();
+    for (int i = 0; i < count; i++) {
+        uint64_t ts = v8profile->GetSampleTimestamp(i);
+        array->addItem(static_cast<int>(ts - lastTime));
+        lastTime = ts;
+    }
     return array;
 }
 
 void flattenNodesTree(v8::Isolate* isolate, const v8::CpuProfileNode* node, protocol::Array<protocol::Profiler::CPUProfileNode>* list)
 {
     list->addItem(buildInspectorObjectFor(isolate, node));
     const int childrenCount = node->GetChildrenCount();
     for (int i = 0; i < childrenCount; i++)
         flattenNodesTree(isolate, node->GetChild(i), list);
 }
 
 std::unique_ptr<protocol::Profiler::CPUProfile> createCPUProfile(v8::Isolate* isolate, v8::CpuProfile* v8profile)
 {
     std::unique_ptr<protocol::Array<protocol::Profiler::CPUProfileNode>> nodes = protocol::Array<protocol::Profiler::CPUProfileNode>::create();
     flattenNodesTree(isolate, v8profile->GetTopDownRoot(), nodes.get());
 
     std::unique_ptr<protocol::Profiler::CPUProfile> profile = protocol::Profiler::CPUProfile::create()
         .setNodes(std::move(nodes))
-        .setStartTime(static_cast<double>(v8profile->GetStartTime()) / 1000000)
-        .setEndTime(static_cast<double>(v8profile->GetEndTime()) / 1000000).build();
+        .setStartTime(static_cast<double>(v8profile->GetStartTime()))
+        .setEndTime(static_cast<double>(v8profile->GetEndTime())).build();
     profile->setSamples(buildInspectorObjectForSamples(v8profile));
-    profile->setTimestamps(buildInspectorObjectForTimestamps(v8profile));
+    profile->setTimestampDeltas(buildInspectorObjectForTimestamps(v8profile));
     return profile;
 }
 
 std::unique_ptr<protocol::Debugger::Location> currentDebugLocation(V8InspectorImpl* inspector)
 {
     std::unique_ptr<V8StackTrace> callStack = inspector->captureStackTrace(1);
     std::unique_ptr<protocol::Debugger::Location> location = protocol::Debugger::Location::create()
         .setScriptId(callStack->topScriptId())
         .setLineNumber(callStack->topLineNumber()).build();
     location->setColumnNumber(callStack->topColumnNumber());
@@ skipping 196 matching lines @@
 v8::CpuProfiler* V8ProfilerAgentImpl::profiler()
 {
 #if ENSURE_V8_VERSION(5, 4)
     return m_profiler;
 #else
     return m_isolate->GetCpuProfiler();
 #endif
 }
 
 } // namespace v8_inspector