Move ZoomObserver, ZoomController and ZoomEventManager to components/.

This CL moves the three classes into components, namespace ui_zoom, and moves
their associated source files into components/ui/zoom so that
they can be used in non-chrome configurations.

BUG=none

TBR=willchan@chromium.org  chrome/browser/profiles
TBR=fsamuel@chromium.org   */web_view/*
TBR=estade@chromium.org chrome/browser/ui/autofill
TBR=pkasting@chromium.org chrome/browser/ui not covered above
TBR=dgozman@chromium.org chrome/browser/devtools
TBR=rsesek@chromium.org chrome/browser/browser_commands_unittest.cc
TBR=sky@chromium.org chrome/browser/renderer_preferences_util.cc

Review URL: https://codereview.chromium.org/769593003

Cr-Commit-Position: refs/heads/master@{#307470}

5 files changed, 57 insertions, 0 deletions

diff --git a/extensions/browser/BUILD.gn b/extensions/browser/BUILD.gn
index 5ac0839..840dc4f 100644
--- a/extensions/browser/BUILD.gn
+++ b/extensions/browser/BUILD.gn
@@ -353,6 +353,8 @@ source_set("browser") {
       "extension_util.h",
       "extension_web_contents_observer.cc",
       "extension_web_contents_observer.h",
+      "extension_zoom_request_client.cc",
+      "extension_zoom_request_client.h",
       "extensions_browser_client.cc",
       "extensions_browser_client.h",
       "external_provider_interface.h",
diff --git a/extensions/browser/DEPS b/extensions/browser/DEPS
index d2863e2..ca34eba 100644
--- a/extensions/browser/DEPS
+++ b/extensions/browser/DEPS
@@ -4,6 +4,7 @@ include_rules = [
   "+components/pref_registry",
   "+components/sessions",
   "+components/storage_monitor",
+  "+components/ui/zoom",
   "+components/web_cache",
   "+components/web_modal",
   "+content/public/browser",
diff --git a/extensions/browser/extension_zoom_request_client.cc b/extensions/browser/extension_zoom_request_client.cc
new file mode 100644
index 0000000..c954532
--- /dev/null
+++ b/extensions/browser/extension_zoom_request_client.cc
@@ -0,0 +1,17 @@
+// Copyright 2014 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 "extensions/browser/extension_zoom_request_client.h"
+
+namespace extensions {
+
+ExtensionZoomRequestClient::ExtensionZoomRequestClient(
+    scoped_refptr<const Extension> extension)
+    : extension_(extension) {
+}
+
+ExtensionZoomRequestClient::~ExtensionZoomRequestClient() {
+}
+
+}  // namespace Extensions
diff --git a/extensions/browser/extension_zoom_request_client.h b/extensions/browser/extension_zoom_request_client.h
new file mode 100644
index 0000000..25d2196
--- /dev/null
+++ b/extensions/browser/extension_zoom_request_client.h
@@ -0,0 +1,35 @@
+// Copyright 2014 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.
+
+#ifndef EXTENSIONS_BROWSER_EXTENSION_ZOOM_REQUEST_CLIENT_H_
+#define EXTENSIONS_BROWSER_EXTENSION_ZOOM_REQUEST_CLIENT_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "components/ui/zoom/zoom_controller.h"
+#include "extensions/common/extension.h"
+
+namespace extensions {
+
+class Extension;
+
+// This class implements ZoomRequestClient in order to encapsulate a ref pointer
+// back to an extension requesting a zoom level change. This is important so
+// that zoom event observers can determine if an extension made the request
+// as opposed to direct user input.
+class ExtensionZoomRequestClient : public ui_zoom::ZoomRequestClient {
+ public:
+  explicit ExtensionZoomRequestClient(scoped_refptr<const Extension> extension);
+
+  const Extension* extension() const { return extension_.get(); }
+
+ private:
+  ~ExtensionZoomRequestClient() override;
+  scoped_refptr<const Extension> extension_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionZoomRequestClient);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_ZOOM_REQUEST_CLIENT_H_
diff --git a/extensions/extensions.gyp b/extensions/extensions.gyp
index 5caf113..31414e4 100644
--- a/extensions/extensions.gyp
+++ b/extensions/extensions.gyp
@@ -635,6 +635,8 @@
         'browser/extension_util.h',
         'browser/extension_web_contents_observer.cc',
         'browser/extension_web_contents_observer.h',
+        'browser/extension_zoom_request_client.cc',
+        'browser/extension_zoom_request_client.h',
         'browser/extensions_browser_client.cc',
         'browser/extensions_browser_client.h',
         'browser/external_provider_interface.h',