Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble/BUILD.gn

Index: components/bubble/BUILD.gn
diff --git a/components/bubble/BUILD.gn b/components/bubble/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..cd9afbd7bb3d8bebcdc5ca183ab745bcc6f7072e
--- /dev/null
+++ b/components/bubble/BUILD.gn
@@ -0,0 +1,30 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("bubble") {
+  sources = [
+    "bubble_close_reason.h",
+    "bubble_controller.cc",
+    "bubble_controller.h",
+    "bubble_delegate.cc",
+    "bubble_delegate.h",
+    "bubble_manager.cc",
+    "bubble_manager.h",
+    "bubble_ui.h",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "bubble_manager_unittest.cc",
+  ]
+
+  deps = [
+    ":bubble",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}