Expose APIs for text track settings

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 033a99604efe96e7d7b243b9e90e29f501bb3993..3dcfc72e68fb7b88ec5ac24a811db43387aba280 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -77,6 +77,7 @@
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/layout/LayoutView.h"
@@ -1246,8 +1247,9 @@ void StyleResolver::applyProperties(StyleResolverState& state, const StyleProper
             continue;
         }
 
-        if (propertyWhitelistType == PropertyWhitelistCue && !isValidCueStyleProperty(property))
+        if (propertyWhitelistType == PropertyWhitelistCue && (!isValidCueStyleProperty(property) || shouldIgnoreTextTrackAuthorStyle()))
             continue;
+
         if (propertyWhitelistType == PropertyWhitelistFirstLetter && !isValidFirstLetterStyleProperty(property))
             continue;
 
@@ -1487,6 +1489,23 @@ bool StyleResolver::mediaQueryAffectedByViewportChange() const
     return false;
 }
 
+bool StyleResolver::shouldIgnoreTextTrackAuthorStyle()
+{
+    Settings* settings = document().settings();
+    if (!settings)
+        return false;
+    // Ignore author specified settings for text tracks when any of the user settings are present.
+    if (!settings->textTrackBackgroundColor().isEmpty()
+        || !settings->textTrackFontFamily().isEmpty()
+        || !settings->textTrackFontStyle().isEmpty()
+        || !settings->textTrackFontVariant().isEmpty()
+        || !settings->textTrackTextColor().isEmpty()
+        || !settings->textTrackTextShadow().isEmpty()
+        || !settings->textTrackTextSize().isEmpty())
+        return true;
+    return false;
+}
+
 DEFINE_TRACE(StyleResolver)
 {
 #if ENABLE(OILPAN)