webapps: utilize manifest theme colors

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
index 0d5ca4d166536798505232c421e02d634e2824f7..0a7b9a1846394c75d1f967b84da297fd6965fa45 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
@@ -262,6 +262,11 @@ public class WebappActivity extends FullScreenActivity {
                 ? getActivityTab().getTitle() : mWebappInfo.title();
         Bitmap icon = mWebappInfo.icon() == null
                 ? getActivityTab().getFavicon() : mWebappInfo.icon();
+
+        if (mBrandColor == null
+                && mWebappInfo.themeColor() != ShortcutHelper.THEME_COLOR_INVALID_OR_MISSING) {
+            mBrandColor = (int) mWebappInfo.themeColor();
+        }

[mlamouri (slow - plz ping), 2015/07/20 13:03:30]

Not related to your change but I'm surprised to see that we don't update the
theme color if |!isWebappDomain()|. Does that mean that we would keep the
Manifest's theme colour if we end up navigating to a different domain that
specifies its own theme colour? 

[Lalit Maganti, 2015/07/20 13:15:19]

Looks like it. Should I remove that check?

[mlamouri (slow - plz ping), 2015/07/20 13:29:45]

Not in this CL but feel free to look into it.

         int color = mBrandColor == null
                 ? getResources().getColor(R.color.default_primary_color) : mBrandColor;
 
@@ -330,7 +335,7 @@ public class WebappActivity extends FullScreenActivity {
      * @param orientation Default orientation for the activity.
      */
     public static void launchInstance(Context context, String id, String url, String icon,
-            String title, int orientation, int source) {
+            String title, int orientation, int source, long themeColor) {
         String activityName = WebappActivity.class.getName();
         if (!FeatureUtilities.isDocumentModeEligible(context)) {
             // Specifically assign the app to a particular WebappActivity instance.
@@ -347,6 +352,7 @@ public class WebappActivity extends FullScreenActivity {
         webappIntent.putExtra(ShortcutHelper.EXTRA_TITLE, title);
         webappIntent.putExtra(ShortcutHelper.EXTRA_ORIENTATION, orientation);
         webappIntent.putExtra(ShortcutHelper.EXTRA_SOURCE, source);
+        webappIntent.putExtra(ShortcutHelper.EXTRA_THEME_COLOR, themeColor);
 
         // On L, firing intents with the exact same data should relaunch a particular Activity.
         webappIntent.setAction(Intent.ACTION_VIEW);