Ensure the entire page is secure for PWAs.

chrome/browser/installable/installable_manager.h

Index: chrome/browser/installable/installable_manager.h
diff --git a/chrome/browser/installable/installable_manager.h b/chrome/browser/installable/installable_manager.h
index 5dbd659be39bc1b4e2a7949840f77d0969a20d50..3f9074165337b689217f88db06053f794d45834c 100644
--- a/chrome/browser/installable/installable_manager.h
+++ b/chrome/browser/installable/installable_manager.h
@@ -81,6 +81,10 @@ class InstallableManager
   explicit InstallableManager(content::WebContents* web_contents);
   ~InstallableManager() override;
 
+  // Returns true if the overall security state of |web_contents| is sufficient
+  // to be considered installable.
+  static bool IsContentSecure(content::WebContents* web_contents);
+
   // Returns the minimum icon size in pixels for a site to be installable.
   // TODO(dominickn): consolidate this concept with minimum_icon_size_in_px
   // across all platforms.