Merge 104582 - Add support for an optional "requirements" section in extension/app manifests.

chrome/common/extensions/extension_constants.cc

Index: chrome/common/extensions/extension_constants.cc
===================================================================
--- chrome/common/extensions/extension_constants.cc	(revision 104911)
+++ chrome/common/extensions/extension_constants.cc	(working copy)
@@ -75,6 +75,7 @@
 const char* kPluginsPath = "path";
 const char* kPluginsPublic = "public";
 const char* kPublicKey = "key";
+const char* kRequirements = "requirements";
 const char* kRunAt = "run_at";
 const char* kShiftKey = "shiftKey";
 const char* kShortcutKey = "shortcutKey";
@@ -317,6 +318,10 @@
     "Invalid value for 'plugins[*].path'.";
 const char* kInvalidPluginsPublic =
     "Invalid value for 'plugins[*].public'.";
+const char* kInvalidRequirement =
+    "Invalid value for requirement \"*\"";
+const char* kInvalidRequirements =
+    "Invalid value for 'requirements'";
 const char* kInvalidRunAt =
     "Invalid value for 'content_scripts[*].run_at'.";
 const char* kInvalidSidebar =