Script streaming: fix small script recognition heuristic.

Source/bindings/core/v8/ScriptStreamer.h

 // Copyright 2014 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.
 
 #ifndef ScriptStreamer_h
 #define ScriptStreamer_h
 
 #include "core/dom/PendingScript.h"
 #include "wtf/RefCounted.h"
 
@@ skipping 66 matching lines @@
     }
 
     // Called by PendingScript when data arrives from the network.
     void notifyAppendData(ScriptResource*);
     void notifyFinished(Resource*);
 
     // Called by ScriptStreamingTask when it has streamed all data to V8 and V8
     // has processed it.
     void streamingComplete();
 
-    static void removeSmallScriptThresholdForTesting()
+    static void setSmallScriptThresholdForTesting(size_t threshold)
     {
-        kSmallScriptThreshold = 0;
+        kSmallScriptThreshold = threshold;
     }
 
     static size_t smallScriptThreshold() { return kSmallScriptThreshold; }
 
 private:
     // Scripts whose first data chunk is smaller than this constant won't be
     // streamed. Non-const for testing.
     static size_t kSmallScriptThreshold;
 
     ScriptStreamer(ScriptResource*, v8::ScriptCompiler::StreamedSource::Encoding, PendingScript::Type);
@@ skipping 12 matching lines @@
     // script data is not needed any more, and the client won't get notified
     // when the loading and streaming are done.
     bool m_detached;
 
     SourceStream* m_stream;
     v8::ScriptCompiler::StreamedSource m_source;
     ScriptResourceClient* m_client;
     WTF::OwnPtr<v8::ScriptCompiler::ScriptStreamingTask> m_task;
     bool m_loadingFinished; // Whether loading from the network is done.
     bool m_parsingFinished; // Whether the V8 side processing is done.
-    bool m_firstDataChunkReceived;
+    // Whether we have received enough data to start the streaming.
+    bool m_haveEnoughDataForStreaming;
 
     // Whether the script source code should be retrieved from the Resource
     // instead of the ScriptStreamer.
     bool m_streamingSuppressed;
 
     // What kind of cached data V8 produces during streaming.
     unsigned m_cachedDataType;
 
     // For recording metrics for different types of scripts separately.
     PendingScript::Type m_scriptType;
 };
 
 } // namespace blink
 
 #endif // ScriptStreamer_h