Change browser/page action default icon defined in manifest to support hidpi.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index 8121aaf013697cd1e54084fcd7e6c591a8e2dd13..43d6912c2bd2508bf5b8e772cb12f5c38b41d6de 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -261,6 +261,7 @@ namespace extension_misc {
     EXTENSION_ICON_MEDIUM = 48,
     EXTENSION_ICON_SMALL = 32,
     EXTENSION_ICON_SMALLISH = 24,
+    EXTENSION_ICON_ACTION = 19,
     EXTENSION_ICON_BITTY = 16,
     EXTENSION_ICON_INVALID = 0,
   };
@@ -269,6 +270,14 @@ namespace extension_misc {
   extern const int kExtensionIconSizes[];
   extern const size_t kNumExtensionIconSizes;
 
+  // List of sizes for extension icons that can be defined in the manifest.
+  extern const int kExtensionActionIconSizes[];
+  extern const size_t kNumExtensionActionIconSizes;
+
+  // List of sizes for extension icons that can be defined in the manifest.
+  extern const int kScriptBadgeIconSizes[];
+  extern const size_t kNumScriptBadgeIconSizes;
+
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_