Enforce the 'requirements' field in manifests.

chrome/browser/extensions/unpacked_installer.h

Index: chrome/browser/extensions/unpacked_installer.h
diff --git a/chrome/browser/extensions/unpacked_installer.h b/chrome/browser/extensions/unpacked_installer.h
index 0aa1f93fbc39eda47a92280058a79f846f909416..6b48857aecdb039279a992d392c49f8c72063755 100644
--- a/chrome/browser/extensions/unpacked_installer.h
+++ b/chrome/browser/extensions/unpacked_installer.h
@@ -6,9 +6,11 @@
 #define CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_
 
 #include <string>
+#include <vector>
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 
 class ExtensionService;
@@ -16,8 +18,11 @@ class ExtensionService;
 namespace extensions {
 
 class Extension;
+class RequirementsChecker;
 
-// Installs and loads an unpacked extension.
+// Installs and loads an unpacked extension. Because internal state needs to be
+// held about the instalation process, only one call to Load*() should be made
+// per UnpackedInstaller.
 // TODO(erikkay): It might be useful to be able to load a packed extension
 // (presumably into memory) without installing it.
 class UnpackedInstaller
@@ -56,6 +61,12 @@ class UnpackedInstaller
   explicit UnpackedInstaller(ExtensionService* extension_service);
   virtual ~UnpackedInstaller();
 
+  // Must be called from the UI thread.
+  void CheckRequirements();
+
+  // Callback from RequirementsChecker.
+  void OnRequirementsChecked(std::vector<std::string> requirement_errors);
+
   // Verifies if loading unpacked extensions is allowed.
   bool IsLoadingUnpackedAllowed() const;
 
@@ -74,7 +85,7 @@ class UnpackedInstaller
   void ReportExtensionLoadError(const std::string& error);
 
   // Called when an unpacked extension has been loaded and installed.
-  void OnLoaded(const scoped_refptr<const Extension>& extension);
+  void OnLoaded();
 
   // Helper to get the Extension::CreateFlags for the installing extension.
   int GetFlags();
@@ -89,6 +100,10 @@ class UnpackedInstaller
   // loading.
   bool prompt_for_plugins_;
 
+  scoped_ptr<RequirementsChecker> requirements_checker_;
+
+  scoped_refptr<const Extension> extension_;
+
   // Whether to require the extension installed to have a modern manifest
   // version.
   bool require_modern_manifest_version_;