Begin work on extension shelf for Linux.

chrome/browser/gtk/browser_window_gtk.cc

Index: chrome/browser/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/gtk/browser_window_gtk.cc b/chrome/browser/gtk/browser_window_gtk.cc
index db15bd9919c7aec51ba0c4c02cc90207851b7304..567535af2f0338d82dbd4ad9de2d8f6bd6a89845 100644
--- a/chrome/browser/gtk/browser_window_gtk.cc
+++ b/chrome/browser/gtk/browser_window_gtk.cc
@@ -36,6 +36,7 @@
 #include "chrome/browser/gtk/clear_browsing_data_dialog_gtk.h"
 #include "chrome/browser/gtk/download_shelf_gtk.h"
 #include "chrome/browser/gtk/edit_search_engine_dialog.h"
+#include "chrome/browser/gtk/extension_shelf_gtk.h"
 #include "chrome/browser/gtk/find_bar_gtk.h"
 #include "chrome/browser/gtk/go_button_gtk.h"
 #include "chrome/browser/gtk/gtk_theme_provider.h"
@@ -645,10 +646,11 @@ void BrowserWindowGtk::SetFullscreen(bool fullscreen) {
   UpdateCustomFrame();
 
   if (fullscreen) {
-    // These three balanced by ShowSupportedWindowFeatures().
+    // These four balanced by ShowSupportedWindowFeatures().
     toolbar_->Hide();
     tabstrip_->Hide();
     bookmark_bar_->Hide(false);
+    extension_shelf_->Hide();
 
     gtk_window_fullscreen(window_);
   } else {
@@ -904,6 +906,10 @@ void BrowserWindowGtk::MaybeShowBookmarkBar(TabContents* contents,
   }
 }
 
+void BrowserWindowGtk::MaybeShowExtensionShelf() {
+  extension_shelf_->Show();
+}
+
 void BrowserWindowGtk::UpdateDevToolsForContents(TabContents* contents) {
   TabContents* old_devtools = devtools_container_->GetTabContents();
   if (old_devtools)
@@ -1108,6 +1114,11 @@ void BrowserWindowGtk::InitWidgets() {
                                          this));
   bookmark_bar_->AddBookmarkbarToBox(content_vbox_);
 
+  extension_shelf_.reset(new ExtensionShelfGtk(browser()->profile(),
+                                               browser_.get()));
+  extension_shelf_->AddShelfToBox(content_vbox_);
+  MaybeShowExtensionShelf();
+
   // This vbox surrounds the render area: find bar, info bars and render view.
   // The reason is that this area as a whole needs to be grouped in its own
   // GdkWindow hierarchy so that animations originating inside it (infobar,
@@ -1407,6 +1418,9 @@ void BrowserWindowGtk::ShowSupportedWindowFeatures() {
 
   if (IsBookmarkBarSupported())
     MaybeShowBookmarkBar(browser_->GetSelectedTabContents(), false);
+
+  if (IsExtensionShelfSupported())
+    MaybeShowExtensionShelf();
 }
 
 void BrowserWindowGtk::HideUnsupportedWindowFeatures() {
@@ -1418,6 +1432,9 @@ void BrowserWindowGtk::HideUnsupportedWindowFeatures() {
 
   if (!IsBookmarkBarSupported())
     bookmark_bar_->Hide(false);
+
+  if (!IsExtensionShelfSupported())
+    extension_shelf_->Hide();
 }
 
 bool BrowserWindowGtk::IsTabStripSupported() {
@@ -1433,6 +1450,10 @@ bool BrowserWindowGtk::IsBookmarkBarSupported() {
   return browser_->SupportsWindowFeature(Browser::FEATURE_BOOKMARKBAR);
 }
 
+bool BrowserWindowGtk::IsExtensionShelfSupported() {
+  return browser_->SupportsWindowFeature(Browser::FEATURE_EXTENSIONSHELF);
+}
+
 bool BrowserWindowGtk::GetWindowEdge(int x, int y, GdkWindowEdge* edge) {
   if (!use_custom_frame_.GetValue())
     return false;