Move MHTML file writing out of the renderer main thread.

third_party/WebKit/Source/web/tests/MHTMLTest.cpp

Index: third_party/WebKit/Source/web/tests/MHTMLTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/MHTMLTest.cpp b/third_party/WebKit/Source/web/tests/MHTMLTest.cpp
index 08a8ce2eb1b5c0c878501ceadde738d77570bf78..13311db8a3ea6354c3d06b28b8a03a31f581f71b 100644
--- a/third_party/WebKit/Source/web/tests/MHTMLTest.cpp
+++ b/third_party/WebKit/Source/web/tests/MHTMLTest.cpp
@@ -143,7 +143,7 @@ protected:
         addResource("http://www.test.com/ol-dot.png", "image/png", "ol-dot.png");
     }
 
-    static PassRefPtr<SharedBuffer> generateMHTMLData(
+    static std::vector<char> generateMHTMLData(
         const Vector<SerializedResource>& resources,
         MHTMLArchive::EncodingPolicy encodingPolicy,
         const String& title, const String& mimeType)
@@ -152,19 +152,19 @@ protected:
         // all the examples in the MHTML spec - RFC 2557.
         String boundary = String::fromUTF8("boundary-example");
 
-        RefPtr<SharedBuffer> mhtmlData = SharedBuffer::create();
-        MHTMLArchive::generateMHTMLHeader(boundary, title, mimeType, *mhtmlData);
+        std::vector<char> mhtmlData;
+        MHTMLArchive::generateMHTMLHeader(boundary, title, mimeType, mhtmlData);
         for (const auto& resource : resources) {
             MHTMLArchive::generateMHTMLPart(
-                boundary, String(), encodingPolicy, resource, *mhtmlData);
+                boundary, String(), encodingPolicy, resource, mhtmlData);
         }
-        MHTMLArchive::generateMHTMLFooter(boundary, *mhtmlData);
-        return mhtmlData.release();
+        MHTMLArchive::generateMHTMLFooter(boundary, mhtmlData);
+        return std::move(mhtmlData);
     }
 
-    PassRefPtr<SharedBuffer> serialize(const char *title, const char *mime,  MHTMLArchive::EncodingPolicy encodingPolicy)
+    std::vector<char> serialize(const char *title, const char *mime,  MHTMLArchive::EncodingPolicy encodingPolicy)
     {
-        return generateMHTMLData(m_resources, encodingPolicy, title, mime);
+        return std::move(generateMHTMLData(m_resources, encodingPolicy, title, mime));
     }
 
 private:
@@ -204,10 +204,10 @@ TEST_F(MHTMLTest, CheckDomain)
 TEST_F(MHTMLTest, TestMHTMLEncoding)
 {
     addTestResources();
-    RefPtr<SharedBuffer> data  = serialize("Test Serialization", "text/html", MHTMLArchive::UseDefaultEncoding);
+    std::vector<char> data = serialize("Test Serialization", "text/html", MHTMLArchive::UseDefaultEncoding);
 
     // Read the MHTML data line per line and do some pseudo-parsing to make sure the right encoding is used for the different sections.
-    LineReader lineReader(std::string(data->data(), data->size()));
+    LineReader lineReader(std::string(&data.front(), data.size()));
     int sectionCheckedCount = 0;
     const char* expectedEncoding = 0;
     std::string line;
@@ -239,7 +239,8 @@ TEST_F(MHTMLTest, TestMHTMLEncoding)
 TEST_F(MHTMLTest, MHTMLFromScheme)
 {
     addTestResources();
-    RefPtr<SharedBuffer> data = serialize("Test Serialization", "text/html", MHTMLArchive::UseDefaultEncoding);
+    std::vector<char> dataVector = serialize("Test Serialization", "text/html", MHTMLArchive::UseDefaultEncoding);
+    RefPtr<SharedBuffer> data = SharedBuffer::create(&dataVector.front(), dataVector.size());
     KURL httpURL = toKURL("http://www.example.com");
     KURL contentURL = toKURL("content://foo");
     KURL fileURL = toKURL("file://foo");