Add directories handling support for apps/extensions.

The change introduces a "include_directories" entry in the manifest
file for file_handlers. In case the value is true, the file handler
becomes a generic handler and adds the given extension to the right
click menu.

BUG=415897

R=mtomasz@chromium.org

Review URL: https://codereview.chromium.org/1407473003

Cr-Commit-Position: refs/heads/master@{#377467}

2 files changed, 15 insertions, 2 deletions

diff --git a/extensions/common/manifest_handlers/file_handler_info.cc b/extensions/common/manifest_handlers/file_handler_info.cc
index 9b0989a..b525c14 100644
--- a/extensions/common/manifest_handlers/file_handler_info.cc
+++ b/extensions/common/manifest_handlers/file_handler_info.cc
@@ -25,7 +25,7 @@ const int kMaxTypeAndExtensionHandlers = 200;
 const char kNotRecognized[] = "'%s' is not a recognized file handler property.";
 }
 
-FileHandlerInfo::FileHandlerInfo() {}
+FileHandlerInfo::FileHandlerInfo() : include_directories(false) {}
 FileHandlerInfo::~FileHandlerInfo() {}
 
 FileHandlers::FileHandlers() {}
@@ -71,8 +71,18 @@ bool LoadFileHandler(const std::string& handler_id,
     return false;
   }
 
+  handler.include_directories = false;
+  if (handler_info.HasKey("include_directories") &&
+      !handler_info.GetBoolean("include_directories",
+                               &handler.include_directories)) {
+    *error = ErrorUtils::FormatErrorMessageUTF16(
+        errors::kInvalidFileHandlerIncludeDirectories, handler_id);
+    return false;
+  }
+
   if ((!mime_types || mime_types->empty()) &&
-      (!file_extensions || file_extensions->empty())) {
+      (!file_extensions || file_extensions->empty()) &&
+      !handler.include_directories) {
     *error = ErrorUtils::FormatErrorMessageUTF16(
         errors::kInvalidFileHandlerNoTypeOrExtension,
         handler_id);
diff --git a/extensions/common/manifest_handlers/file_handler_info.h b/extensions/common/manifest_handlers/file_handler_info.h
index ac458e1..ac9e51d 100644
--- a/extensions/common/manifest_handlers/file_handler_info.h
+++ b/extensions/common/manifest_handlers/file_handler_info.h
@@ -27,6 +27,9 @@ struct FileHandlerInfo {
 
   // MIME types associated with this handler.
   std::set<std::string> types;
+
+  // True if the handler can manage directories.
+  bool include_directories;
 };
 
 typedef std::vector<FileHandlerInfo> FileHandlersInfo;