Task Manager: Make double-clicking on an extension do something useful.

chrome/browser/task_management/providers/web_contents/extension_task.cc

Index: chrome/browser/task_management/providers/web_contents/extension_task.cc
diff --git a/chrome/browser/task_management/providers/web_contents/extension_task.cc b/chrome/browser/task_management/providers/web_contents/extension_task.cc
index 9e6da132398dc92de57dfc0a6d46ab3a8f4b768e..f523a6182e3c7bf4691d34abad0eea7304e5fef0 100644
--- a/chrome/browser/task_management/providers/web_contents/extension_task.cc
+++ b/chrome/browser/task_management/providers/web_contents/extension_task.cc
@@ -5,8 +5,13 @@
 #include "chrome/browser/task_management/providers/web_contents/extension_task.h"
 
 #include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/chrome_pages.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
+#include "extensions/browser/process_manager.h"
 #include "extensions/browser/view_type_utils.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
@@ -58,6 +63,32 @@ void ExtensionTask::UpdateFavicon() {
   // extension.
 }
 
+void ExtensionTask::Activate() {
+  // This task represents the extension view of (for example) a background page
+  // or browser action button, so there is no top-level window to bring to the
+  // front. Instead, when this task is double-clicked, we bring up the
+  // chrome://extensions page in a tab, and highlight the details for this
+  // extension.
+  //
+  // TODO(nick): For extensions::VIEW_TYPE_APP_WINDOW, and maybe others, there
+  // may actually be a window we could focus. Special case those here as needed.
+  const extensions::Extension* extension =
+      extensions::ProcessManager::Get(web_contents()->GetBrowserContext())
+          ->GetExtensionForWebContents(web_contents());
+
+  if (!extension)
+    return;
+
+  Browser* browser = chrome::FindTabbedBrowser(
+      Profile::FromBrowserContext(web_contents()->GetBrowserContext()), true);
+
+  // If an existing browser isn't found, don't create a new one.
+  if (!browser)
+    return;
+
+  chrome::ShowExtensions(browser, extension->id());
+}
+
 Task::Type ExtensionTask::GetType() const {
   return Task::EXTENSION;
 }