Implement clipboardRead/Write content capabilities

extensions/common/manifest_handlers/content_capabilities_handler.cc

Index: extensions/common/manifest_handlers/content_capabilities_handler.cc
diff --git a/extensions/common/manifest_handlers/content_capabilities_handler.cc b/extensions/common/manifest_handlers/content_capabilities_handler.cc
index a55bb8273d215eded92b4bffffff6acee66f79fb..b9b0f7433cd50638e2156bb7c11b6fe97c3aa229 100644
--- a/extensions/common/manifest_handlers/content_capabilities_handler.cc
+++ b/extensions/common/manifest_handlers/content_capabilities_handler.cc
@@ -4,11 +4,13 @@
 
 #include "extensions/common/manifest_handlers/content_capabilities_handler.h"
 
+#include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
+#include "content/public/common/content_switches.h"
 #include "extensions/common/api/extensions_manifest_types.h"
 #include "extensions/common/error_utils.h"
 #include "extensions/common/install_warning.h"
@@ -61,10 +63,16 @@ bool ContentCapabilitiesHandler::Parse(Extension* extension,
   if (!capabilities)
     return false;
 
+  int supported_schemes = URLPattern::SCHEME_HTTPS;
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kTestType)) {
+    supported_schemes |= URLPattern::SCHEME_HTTP;

[not at google - send to devlin, 2014/12/10 17:33:54]

Mention why (... and shame there is no https mode for the embedded test
server..?)

[Ken Rockot(use gerrit already), 2014/12/10 18:31:41]

Heh. Done.

+  }
+
   std::string url_error;
   URLPatternSet potential_url_patterns;
   if (!potential_url_patterns.Populate(capabilities->matches,
-          URLPattern::SCHEME_HTTPS, false /* allow_file_access */,
+          supported_schemes, false /* allow_file_access */,
           &url_error)) {
     *error = ErrorUtils::FormatErrorMessageUTF16(
         errors::kInvalidContentCapabilitiesMatch, url_error);