[Android WebView] Avoid expanding layout width to match the old WebView

Source/web/WebSettingsImpl.h

Index: Source/web/WebSettingsImpl.h
diff --git a/Source/web/WebSettingsImpl.h b/Source/web/WebSettingsImpl.h
index 6c0d2521b99f90a990ba8c5ee6f9dbe51191d845..0206df9301a100e08cfce56b5bdbdab8cd0c8e8c 100644
--- a/Source/web/WebSettingsImpl.h
+++ b/Source/web/WebSettingsImpl.h
@@ -165,6 +165,7 @@ public:
     virtual void setUseWideViewport(bool);
     virtual void setValidationMessageTimerMagnification(int);
     virtual void setViewportEnabled(bool);
+    virtual void setViewportMetaLayoutSizeQuirk(bool);
     virtual void setVisualWordMovementEnabled(bool);
     virtual void setWebAudioEnabled(bool);
     virtual void setWebGLErrorsToConsoleEnabled(bool);
@@ -179,6 +180,7 @@ public:
     bool doubleTapToZoomEnabled() const { return m_doubleTapToZoomEnabled; }
     bool perTilePaintingEnabled() const { return m_perTilePaintingEnabled; }
     bool supportDeprecatedTargetDensityDPI() const { return m_supportDeprecatedTargetDensityDPI; }
+    bool viewportMetaLayoutSizeQuirk() const { return m_viewportMetaLayoutSizeQuirk; }
     int pinchOverlayScrollbarThickness() const { return m_pinchOverlayScrollbarThickness; }
 
 private:
@@ -192,6 +194,10 @@ private:
     bool m_doubleTapToZoomEnabled;
     bool m_perTilePaintingEnabled;
     bool m_supportDeprecatedTargetDensityDPI;
+    // This quirk is to maintain compatibility with Android apps built on
+    // the Android SDK prior to and including version 18. Presumably, this
+    // can be removed any time after 2015. See http://crbug.com/277369.
+    bool m_viewportMetaLayoutSizeQuirk;
     int m_pinchOverlayScrollbarThickness;
 };