Don't use the manifest brand color when a PWA is in immersive fullscreen.

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 243d7f1152777997f6c04f7ed3be63b46a77c85e..8cda9a60109a43362fe1c41fe3076a926e23b4e5 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
@@ -619,8 +619,13 @@ public class WebappActivity extends FullScreenActivity {
 
         int taskDescriptionColor =
                 ApiCompatibilityUtils.getColor(getResources(), R.color.default_primary_color);
+
+        // Don't use the brand color for the status bars if we're in display: fullscreen. This works
+        // around an issue where the status bars go transparent and can't be seen on top of the page
+        // content when users swipe them in or they appear because the on-screen keyboard was
+        // triggered.
         int statusBarColor = Color.BLACK;
-        if (mBrandColor != null) {
+        if (mBrandColor != null && mWebappInfo.displayMode() != WebDisplayMode.FULLSCREEN) {
             taskDescriptionColor = mBrandColor;
             statusBarColor = ColorUtils.getDarkenedColorForStatusBar(mBrandColor);
         }