Add --enable-input-mode-attribute commandline switch

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 63e94dfdc9038d3957ab8449eecdeab137890707..edc947040d39e8c0a48e9ca6c73dcba4dbe1e433 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -405,6 +405,9 @@ extern const char kEnableHTMLImports[]      = "enable-html-imports";
 // Enables support for inband text tracks in media content.
 const char kEnableInbandTextTracks[]        = "enable-inband-text-tracks";
 
+// Enable inputmode attribute of HTML input or text element.
+extern const char kEnableInputModeAttribute[] = "enable-input-mode-attribute";
+
 // Force logging to be enabled.  Logging is disabled by default in release
 // builds.
 const char kEnableLogging[]                 = "enable-logging";