Add remaining text/caret navigation commands to ChromeVox Next.

chrome/common/extensions/command.cc

Index: chrome/common/extensions/command.cc
diff --git a/chrome/common/extensions/command.cc b/chrome/common/extensions/command.cc
index 8a07d95f566ea3950eeabc34bea547294cf17c7a..ff58db820e62876118f998aff6387ad436c35f82 100644
--- a/chrome/common/extensions/command.cc
+++ b/chrome/common/extensions/command.cc
@@ -28,6 +28,12 @@ static const char kMissing[] = "Missing";
 static const char kCommandKeyNotSupported[] =
     "Command key is not supported. Note: Ctrl means Command on Mac";
 
+#if defined(OS_CHROMEOS)
+static const int kMaxTokenSize = 4;

[Finnur, 2014/10/30 10:04:06]

Nit: I'd comment this with:
// ChromeOS supports an additional modifier 'Search', which can
// result in longer sequences.

[David Tseng, 2014/10/30 17:01:46]

Done.

+#else
+static const int kMaxTokenSize = 3;
+#endif  // OS_CHROMEOS
+
 bool IsNamedCommand(const std::string& command_name) {
   return command_name != values::kPageActionCommandEvent &&
          command_name != values::kBrowserActionCommandEvent;
@@ -62,7 +68,7 @@ ui::Accelerator ParseImpl(const std::string& accelerator,
   base::SplitString(accelerator, '+', &tokens);
   if (tokens.size() == 0 ||
       (tokens.size() == 1 && DoesRequireModifier(accelerator)) ||
-      tokens.size() > 3) {
+      tokens.size() > kMaxTokenSize) {
     *error = ErrorUtils::FormatErrorMessageUTF16(
         errors::kInvalidKeyBinding,
         base::IntToString(index),