Media Galleries API Scanning: Add Scan Permission and basic test.

chrome/common/extensions/permissions/media_galleries_permission.cc

Index: chrome/common/extensions/permissions/media_galleries_permission.cc
diff --git a/chrome/common/extensions/permissions/media_galleries_permission.cc b/chrome/common/extensions/permissions/media_galleries_permission.cc
index b95777bdcde75236173fc9f0171fafb338ac603d..b6cb4f647553f4984afe495c176ad2b2fbed7a40 100644
--- a/chrome/common/extensions/permissions/media_galleries_permission.cc
+++ b/chrome/common/extensions/permissions/media_galleries_permission.cc
@@ -31,6 +31,7 @@ namespace extensions {
 
 const char MediaGalleriesPermission::kAllAutoDetectedPermission[] =
     "allAutoDetected";
+const char MediaGalleriesPermission::kScanPermission[] = "scan";
 const char MediaGalleriesPermission::kReadPermission[] = "read";
 const char MediaGalleriesPermission::kCopyToPermission[] = "copyTo";
 const char MediaGalleriesPermission::kDeletePermission[] = "delete";
@@ -58,6 +59,9 @@ bool MediaGalleriesPermission::FromValue(const base::Value* value) {
     if (it->permission() == kAllAutoDetectedPermission) {
       continue;
     }
+    if (it->permission() == kScanPermission) {

[Lei Zhang, 2014/01/29 21:16:11]

Combine with the kAllAutoDetectedPermission if block?

[tommycli, 2014/01/29 22:30:18]

Done.

+      continue;
+    }
     if (it->permission() == kReadPermission) {
       has_read = true;
       continue;