Resolve styles by font table if not specified.

android:fontStyle and android:fontWeight is an optional attribute.
If they are missing, we are using non-italic 400 weight, but this is
not good idea. We should resolve these style value from font metadata.

Bug: 37988154
Test: am instrument -w -e class android.content.res.cts.ResourcesTest
      android.content.cts/android.support.test.runner.AndroidJUnitRunner

Change-Id: I80a436cd3632d8c58fa3d8bdaedac73b95f61a8c

graphics/java/android/graphics/Typeface.java

@@ -233,8 +233,7 @@ public class Typeface {
                 // TODO: Add ttc and variation font support. (b/37853920)
                 if (!fontFamily.addFontFromAssetManager(mgr, fontFile.getFileName(),
                         0 /* resourceCookie */, false /* isAsset */, 0 /* ttcIndex */,
-                        fontFile.getWeight(), fontFile.isItalic() ? STYLE_ITALIC : STYLE_NORMAL,
-                        null /* axes */)) {
+                        fontFile.getWeight(), fontFile.getItalic(), null /* axes */)) {
                     return null;
                 }
             }