Add <meta viewport> support to the preloader

Source/core/html/parser/HTMLDocumentParser.cpp

Index: Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/Source/core/html/parser/HTMLDocumentParser.cpp b/Source/core/html/parser/HTMLDocumentParser.cpp
index dc0f6e98275ddc9b3cb2c5f96327d8f1bbd1949c..887521107b7638ee7c04b047ee6d72ed27a1c1a5 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -32,6 +32,7 @@
 #include "core/dom/DocumentLifecycleObserver.h"
 #include "core/dom/Element.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/parser/AtomicHTMLToken.h"
 #include "core/html/parser/BackgroundHTMLParser.h"
@@ -670,7 +671,11 @@ void HTMLDocumentParser::pumpTokenizer()
         // adding paranoia if for speculative crash fix for crbug.com/465478
         if (m_preloader) {
             if (!m_preloadScanner) {
-                m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), createMediaValues(document())));
+                m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options,
+                    document()->url(),
+                    createMediaValues(document()),
+                    document()->viewportDefaultMinWidth(),
+                    document()->settings() && document()->settings()->viewportMetaZeroValuesQuirk()));

[kouhei (in TOK), 2015/04/30 12:45:39]

Can these 3 parameters be made a struct? with a helper method to initialize it
from document()?
I'm a bit concerned about duplicated code.

                 m_preloadScanner->appendToEnd(m_input.current());
             }
             m_preloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -751,8 +756,13 @@ void HTMLDocumentParser::insert(const SegmentedString& source)
     if (isWaitingForScripts()) {
         // Check the document.write() output with a separate preload scanner as
         // the main scanner can't deal with insertions.
-        if (!m_insertionPreloadScanner)
-            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), createMediaValues(document())));
+        if (!m_insertionPreloadScanner) {
+            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options,
+                document()->url(),
+                createMediaValues(document()),
+                document()->viewportDefaultMinWidth(),
+                document()->settings() && document()->settings()->viewportMetaZeroValuesQuirk()));
+        }
 
         m_insertionPreloadScanner->appendToEnd(source);
         m_insertionPreloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -766,6 +776,7 @@ void HTMLDocumentParser::startBackgroundParser()
     ASSERT(!isStopped());
     ASSERT(shouldUseThreading());
     ASSERT(!m_haveBackgroundParser);
+    ASSERT(document());
     m_haveBackgroundParser = true;
 
     RefPtr<WeakReference<BackgroundHTMLParser>> reference = WeakReference<BackgroundHTMLParser>::createUnbound();
@@ -782,7 +793,10 @@ void HTMLDocumentParser::startBackgroundParser()
     config->parser = m_weakFactory.createWeakPtr();
     config->xssAuditor = adoptPtr(new XSSAuditor);
     config->xssAuditor->init(document(), &m_xssAuditorDelegate);
-    config->preloadScanner = adoptPtr(new TokenPreloadScanner(document()->url().copy(), createMediaValues(document())));
+    config->preloadScanner = adoptPtr(new TokenPreloadScanner(document()->url().copy(),
+        createMediaValues(document()),
+        document()->viewportDefaultMinWidth(),
+        document()->settings() && document()->settings()->viewportMetaZeroValuesQuirk()));
     config->decoder = takeDecoder();
 
     ASSERT(config->xssAuditor->isSafeToSendToAnotherThread());