Allow silent extension installations from the extensions gallery - Part 1.

In this episode we:
-Create a new ChildProcess privilege (SILENT_INSTALL_EXTENSION) which is granted to the extension gallery pages.
-Ensure that extension gallery pages are isolated into their own process which is never shared with other urls.

Important: The SILENT_INSTALL_EXTENSION privilege is never granted any additional abilities in this patch, so this patch only has the effect of grouping gallery URLs into a separate process.

In subsequent patch(es) we plan to (a) observe this new privilege and allow gallery urls to install extensions bypassing the normal prompts, (b) polish this UI flow [in particular, do not show the black "loading" dilaog, (c) check the id of the extension to be installed (from the crx) matches the expected id (from gallery url).

BUG=27431

Review URL: http://codereview.chromium.org/400018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33952 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 34 insertions, 0 deletions

diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index 94d6de2..04ae051c 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -128,6 +128,32 @@ const std::string Extension::VersionString() const {
 }
 
 // static
+bool Extension::IsGalleryURL(const GURL& url) {
+  return StartsWithASCII(url.spec(),
+      std::string(extension_urls::kGalleryBrowsePrefix), true);
+}
+
+// static
+bool Extension::IsDownloadFromGallery(const GURL& download_url,
+                                      const GURL& referrer_url) {
+  if (StartsWithASCII(download_url.spec(),
+                      extension_urls::kMiniGalleryDownloadPrefix, false) &&
+      StartsWithASCII(referrer_url.spec(),
+                      extension_urls::kMiniGalleryBrowsePrefix, false)) {
+    return true;
+  }
+
+  if (StartsWithASCII(download_url.spec(),
+                      extension_urls::kGalleryDownloadPrefix, false) &&
+      StartsWithASCII(referrer_url.spec(),
+                      extension_urls::kGalleryBrowsePrefix, false)) {
+    return true;
+  }
+
+  return false;
+}
+
+// static
 bool Extension::IsExtension(const FilePath& file_name) {
   return file_name.MatchesExtension(
       FilePath::StringType(FILE_PATH_LITERAL(".")) +
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 331de16..28bffc1 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -122,6 +122,14 @@ class Extension {
   explicit Extension(const FilePath& path);
   virtual ~Extension();
 
+  // Determine if a given |url| is a gallery browse URL.
+  static bool IsGalleryURL(const GURL& url);
+
+  // Determine if a given extension download should be treated as if it came
+  // from the theme gallery.
+  static bool IsDownloadFromGallery(const GURL& download_url,
+                                    const GURL& referrer_url);
+
   // Checks to see if the extension has a valid ID.
   static bool IdIsValid(const std::string& id);