Implement Aura side of unified touch text selection for contents

This is the first part of unified touch text selection for Aura which
implements it using the new ui::TouchSelectionController for contents.

Selection updates are now coming from swap-compositor-frame IPC message
instead of selection-bounds-changed IPC message.

This CL also replaces TouchEditableImplAura (owned by
WebContentsViewAura) with ui::TouchSelectionController (owned by
RenderWidgetHostViewAura) for which a client implementation is provided
in TouchSelectionControllerClientAura.

Note that at the moment we are unable to remove selection-bounds-changed
IPC message completely as it is also used by IME and the new path is not
yet working properly inside <webview> (which is being worked on).

Next part would be using ui::TouchSelectionController to implement
unified touch text selection for Views textfields.

COLLABORATOR=mfomitchev
BUG=399721

Review URL: https://codereview.chromium.org/698253004

Cr-Commit-Position: refs/heads/master@{#341134}

1 files changed, 23 insertions, 0 deletions

diff --git a/ui/touch_selection/touch_selection_controller_test_api.cc b/ui/touch_selection/touch_selection_controller_test_api.cc
new file mode 100644
index 0000000..abe89de
--- /dev/null
+++ b/ui/touch_selection/touch_selection_controller_test_api.cc
@@ -0,0 +1,23 @@
+// 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.
+
+#include "ui/touch_selection/touch_selection_controller_test_api.h"
+
+namespace ui {
+
+TouchSelectionControllerTestApi::TouchSelectionControllerTestApi(
+    TouchSelectionController* controller)
+    : controller_(controller) {}
+
+TouchSelectionControllerTestApi::~TouchSelectionControllerTestApi() {}
+
+bool TouchSelectionControllerTestApi::GetStartVisible() const {
+  return controller_->GetStartVisible();
+}
+
+bool TouchSelectionControllerTestApi::GetEndVisible() const {
+  return controller_->GetEndVisible();
+}
+
+}  // namespace ui