[TabModal] Add toolbar animation on JS dialog shown

Add animation for the Android toolbar view to slide in when JavaScript
tab modal dialog is showing and the renderer is blocked on input events.

Bug: 817461
Change-Id: I3ed69ffabe736100ac209be59f34eeedd4189cee
Reviewed-on: https://chromium-review.googlesource.com/942378
Commit-Queue: Becky Zhou <[email protected]>
Reviewed-by: Ted Choc <[email protected]>
Reviewed-by: Matthew Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#547062}
diff --git a/chrome/android/java_sources.gni b/chrome/android/java_sources.gni
index 618415c..fd5548a 100644
--- a/chrome/android/java_sources.gni
+++ b/chrome/android/java_sources.gni
@@ -1214,6 +1214,7 @@
   "java/src/org/chromium/chrome/browser/tab/SadTabView.java",
   "java/src/org/chromium/chrome/browser/tab/SadTabViewFactory.java",
   "java/src/org/chromium/chrome/browser/tab/Tab.java",
+  "java/src/org/chromium/chrome/browser/tab/TabBrowserControlsOffsetHelper.java",
   "java/src/org/chromium/chrome/browser/tab/TabContextMenuItemDelegate.java",
   "java/src/org/chromium/chrome/browser/tab/TabContextMenuPopulator.java",
   "java/src/org/chromium/chrome/browser/tab/TabDelegateFactory.java",