Toolbar: Add DEPS

toolbar/ package is being modularized. Adds a DEPS file in toolbar/
to discourage new dependencies on chrome core package. Except for
ToolbarManager/ToolbarButtonIPHController not planned to be a part
of the modularized target, the rule mandates the toolbar classes not
include files from chrome_java.

Bug: 1127732
Change-Id: I36b1ed6d6951c92d7f2db4affe14b551843cc143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2512498
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836933}

chrome/android/java/src/org/chromium/chrome/browser/toolbar/DEPS

+noparent = True
+
+include_rules = [
+  "-chrome/android/java/src/org/chromium/chrome/browser",
+  "+chrome/android/java/src/org/chromium/chrome/browser/toolbar",
+  "+chrome/android/java/src/org/chromium/chrome/browser/omnibox",
+]
+
+specific_include_rules = {
+  'ToolbarManager.java': [
+    "+chrome/android/java/src/org/chromium/chrome/browser",
+    "-chrome/android/java/src/org/chromium/chrome/browser/app/ChromeActivity.java",
+  ],
+  'ToolbarButtonInProductHelpController.java': [
+    "+chrome/android/java/src/org/chromium/chrome/browser",
+    "-chrome/android/java/src/org/chromium/chrome/browser/app/ChromeActivity.java",
+  ]
+}