Add "inspect background page" to platform app right-click menu.

chrome/browser/extensions/platform_app_browsertest_util.h

Index: chrome/browser/extensions/platform_app_browsertest_util.h
diff --git a/chrome/browser/extensions/platform_app_browsertest_util.h b/chrome/browser/extensions/platform_app_browsertest_util.h
index 08c515ff65bd7a11a09d8251d94c255e2efadc59..3d3a2a7d40efd36e9d4d74b9e443b0147b72f2b3 100644
--- a/chrome/browser/extensions/platform_app_browsertest_util.h
+++ b/chrome/browser/extensions/platform_app_browsertest_util.h
@@ -28,6 +28,10 @@ class PlatformAppBrowserTest : public ExtensionApiTest {
   // until it is launched.
   const Extension* LoadAndLaunchPlatformApp(const char* name);
 
+  // Installs and runs the app named |name| out of the platform_apps
+  // subdirectory. Waits until it is launched.
+  const Extension* InstallAndLaunchPlatformApp(const char* name);
+
   // Gets the WebContents associated with the first shell window that is found
   // (most tests only deal with one platform app window, so this is good
   // enough).