Use consistent status bar theming in webapps

This patch changes WebappActivity to use the status bar theming
methods in the parent ChromeActivity rather than directly calling
the api compat method. As a result, webapps will have status bar
theming logic consistent with other chrome activities. The overrides
now ignore incoming theme colors in favor of it's own brand color.

Bug: 801474
Change-Id: I1f21de0465aea5262ea30d1912153461f71e41bc
Reviewed-on: https://chromium-review.googlesource.com/c/1435914Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626124}

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

@@ -767,7 +767,7 @@ public class WebappActivity extends SingleTabActivity {
         int statusBarColor = Color.BLACK;
         if (mBrandColor != null && mWebappInfo.displayMode() != WebDisplayMode.FULLSCREEN) {
             taskDescriptionColor = mBrandColor;
-            statusBarColor = ColorUtils.getDarkenedColorForStatusBar(mBrandColor);
+            statusBarColor = mBrandColor;
             if (getToolbarManager() != null) {
                 getToolbarManager().onThemeColorChanged(mBrandColor, false);
             }
@@ -775,17 +775,21 @@ public class WebappActivity extends SingleTabActivity {
 
         ApiCompatibilityUtils.setTaskDescription(this, title, icon,
                 ColorUtils.getOpaqueColor(taskDescriptionColor));
-        ApiCompatibilityUtils.setStatusBarColor(getWindow(), statusBarColor);
+        setStatusBarColor(statusBarColor, statusBarColor != Color.BLACK);
     }
 
     @Override
     protected void setStatusBarColor(Tab tab, int color) {
-        // Intentionally do nothing as WebappActivity explicitly sets status bar color.
+        // Ignore any color that is not the brand color.
+        super.setStatusBarColor(
+                mBrandColor == null ? Color.BLACK : mBrandColor, mBrandColor == null);
     }
 
     @Override
     protected void setStatusBarColor(int color, boolean isDefaultThemeColor) {
-        // Intentionally do nothing as WebappActivity explicitly sets status bar color.
+        // Ignore any color that is not the brand color.
+        super.setStatusBarColor(
+                mBrandColor == null ? Color.BLACK : mBrandColor, mBrandColor == null);
     }
 
     @Override