Cache web app data for home screen sites declaring "display": "fullscreen" in their manifest.

chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java
index 92e6bf64422c4dd5d4f5eae29f6360bf84cea420..382e5c808c9bd099bc415698f3876c8f5307b563 100644
--- a/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebappDataStorageTest.java
@@ -245,13 +245,14 @@ public class WebappDataStorageTest {
         final String name = "name";
         final String shortName = "shortName";
         final Bitmap icon = createBitmap();
+        final int displayMode = 3;

[gone, 2016/05/10 19:41:20]

Shouldn't you be using a real displayMode here?

[dominickn, 2016/05/11 04:24:21]

Yes, I should. However, the tests didn't compile when I imported
WebDisplayMode - it's in blink_public, and I couldn't work out
how/where to get those files included in the test binary so I gave
up. If you can point out how to do it I'd much prefer using a real
value here.

[mlamouri (slow - plz ping), 2016/05/11 10:18:57]

I think you can add:
"//third_party/WebKit/public:blink_headers_java",

to junit_binary("chrome_junit_tests") in:
chrome/android/BUILD.gn

I didn't try so it might be entirely wrong :)

         final int orientation = 1;
         final long themeColor = 2;
         final long backgroundColor = 3;
         final boolean isIconGenerated = false;
         Intent shortcutIntent = ShortcutHelper.createWebappShortcutIntent(id, action, url, scope,
-                name, shortName, icon, ShortcutHelper.WEBAPP_SHORTCUT_VERSION, orientation,
-                themeColor, backgroundColor, isIconGenerated);
+                name, shortName, icon, ShortcutHelper.WEBAPP_SHORTCUT_VERSION, displayMode,
+                orientation, themeColor, backgroundColor, isIconGenerated);
 
         WebappDataStorage storage = WebappDataStorage.open(Robolectric.application, "test");
         storage.updateFromShortcutIntent(shortcutIntent);