Support performance.now() in workers.

Source/modules/performance/WorkerPerformance.cpp

Index: Source/modules/performance/WorkerPerformance.cpp
diff --git a/Source/core/html/ime/Composition.cpp b/Source/modules/performance/WorkerPerformance.cpp
similarity index 71%
copy from Source/core/html/ime/Composition.cpp
copy to Source/modules/performance/WorkerPerformance.cpp
index e74501bcd8637afa85872dae701e91f04827e1ee..21911532a910a86e10507e9c71a8f576bd588c36 100644
--- a/Source/core/html/ime/Composition.cpp
+++ b/Source/modules/performance/WorkerPerformance.cpp
@@ -29,27 +29,30 @@
  */
 
 #include "config.h"
-#include "core/html/ime/Composition.h"
+#include "modules/performance/WorkerPerformance.h"
 
-#include "core/dom/Node.h"
-#include "core/dom/Range.h"
+#include "core/workers/DedicatedWorkerContext.h"
+#include "core/workers/WorkerContext.h"
+#include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
-Composition::~Composition()
+WorkerPerformance::WorkerPerformance(ScriptExecutionContext* context)
+    : ContextDestructionObserver(context)
 {
 }
 
-PassRefPtr<Composition> Composition::create(Node* text, Range* caret)
+WorkerPerformance::~WorkerPerformance()
 {
-    return adoptRef(new Composition(text, caret));
 }
 
-Composition::Composition(Node* text, Range* caret)
-    : m_text(text)
-    , m_caret(caret)
+double WorkerPerformance::now() const
 {
-    ScriptWrappable::init(this);
+    ScriptExecutionContext* context = scriptExecutionContext();
+    ASSERT(context);
+    ASSERT_WITH_SECURITY_IMPLICATION(context->isWorkerContext());
+    WorkerContext* workerContext = static_cast<WorkerContext*>(context);
+    return 1000.0 * (monotonicallyIncreasingTime() - workerContext->timeOrigin());

[abarth-chromium, 2013/06/13 22:27:16]

I missed it the first time too, but it's here on this line.

 }
 
 } // namespace WebCore