Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm

Index: chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm b/chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm
index 06d7fbe488ab85aa5221c0d7ff445d05e71f68d1..7306dd10c75c8b4cea9d06142bcf406b21529732 100644
--- a/chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm
+++ b/chrome/browser/ui/cocoa/location_bar/zoom_decoration.mm
@@ -11,8 +11,9 @@
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h"
 #import "chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h"
 #import "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
-#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "chrome/grit/generated_resources.h"
+#include "components/ui/zoom/zoom_controller.h"
+#include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 ZoomDecoration::ZoomDecoration(LocationBarViewMac* owner)
@@ -24,7 +25,8 @@ ZoomDecoration::~ZoomDecoration() {
   [bubble_ closeWithoutAnimation];
 }
 
-bool ZoomDecoration::UpdateIfNecessary(ZoomController* zoom_controller) {
+bool ZoomDecoration::UpdateIfNecessary(
+    ui_zoom::ZoomController* zoom_controller) {
   if (!ShouldShowDecoration()) {
     if (!IsVisible() && !bubble_)
       return false;
@@ -77,10 +79,17 @@ void ZoomDecoration::HideUI() {
   SetVisible(false);
 }
 
-void ZoomDecoration::ShowAndUpdateUI(ZoomController* zoom_controller,
+void ZoomDecoration::ShowAndUpdateUI(ui_zoom::ZoomController* zoom_controller,
                                      NSString* tooltip_string) {
-  SetImage(OmniboxViewMac::ImageForResource(
-      zoom_controller->GetResourceForZoomLevel()));
+  int image_id = IDR_ZOOM_NORMAL;
+  ui_zoom::ZoomController::RelativeZoom relative_zoom =
+      zoom_controller->GetZoomRelativeToDefault();
+  if (relative_zoom == ui_zoom::ZoomController::ZOOM_BELOW_DEFAULT_ZOOM)
+    image_id = IDR_ZOOM_MINUS;
+  else if (relative_zoom == ui_zoom::ZoomController::ZOOM_ABOVE_DEFAULT_ZOOM)
+    image_id = IDR_ZOOM_PLUS;
+
+  SetImage(OmniboxViewMac::ImageForResource(image_id));
 
   tooltip_.reset([tooltip_string retain]);
 
@@ -97,8 +106,8 @@ bool ZoomDecoration::IsAtDefaultZoom() const {
   if (!web_contents)
     return false;
 
-  ZoomController* zoomController =
-      ZoomController::FromWebContents(web_contents);
+  ui_zoom::ZoomController* zoomController =
+      ui_zoom::ZoomController::FromWebContents(web_contents);
   return zoomController && zoomController->IsAtDefaultZoom();
 }