Add Roboto Light and Light italic fonts, as sans-serif-light family

Change-Id: Ibbdd7a74f3731c8e9c9fe60ce04a179c081bc09c

data/fonts/Android.mk

@@ -142,6 +142,8 @@ font_src_files := \
     Roboto-Bold.ttf \
     Roboto-Italic.ttf \
     Roboto-BoldItalic.ttf \
+    Roboto-Light.ttf \
+    Roboto-LightItalic.ttf \
     DroidNaskh-Regular.ttf \
     DroidNaskh-Regular-SystemUI.ttf \
     DroidSansDevanagari-Regular.ttf \

data/fonts/fonts.mk

@@ -24,6 +24,8 @@ PRODUCT_PACKAGES := \
     Roboto-Bold.ttf \
     Roboto-Italic.ttf \
     Roboto-BoldItalic.ttf \
+    Roboto-Light.ttf \
+    Roboto-LightItalic.ttf \
     DroidNaskh-Regular.ttf \
     DroidNaskh-Regular-SystemUI.ttf \
     DroidSansDevanagari-Regular.ttf \

data/fonts/system_fonts.xml

@@ -34,6 +34,16 @@
         </fileset>
     </family>
 
+    <family>
+        <nameset>
+            <name>sans-serif-light</name>
+        </nameset>
+        <fileset>
+            <file>Roboto-Light.ttf</file>
+            <file>Roboto-LightItalic.ttf</file>
+        </fileset>
+    </family>
+
     <family>
         <nameset>
             <name>serif</name>