crbug.com/127841 - Request Tablet Site on CB with touch screen.

webkit/glue/user_agent.cc

Index: webkit/glue/user_agent.cc
diff --git a/webkit/glue/user_agent.cc b/webkit/glue/user_agent.cc
index 516504081f136db4e1551c71f4a3237b020e373e..79151e547dd76205621667b26ad56f0313ab5cca 100644
--- a/webkit/glue/user_agent.cc
+++ b/webkit/glue/user_agent.cc
@@ -28,6 +28,11 @@ base::LazyInstance<std::string>::Leaky g_os_info = LAZY_INSTANCE_INITIALIZER;
 }  // namespace
 #endif
 
+namespace {
+const char kUserAgentOverrideForTabletSite[] =
+    "(Linux; Android 4.0.4; Galaxy Nexus Build/IMM76B)";
+}
+
 namespace webkit_glue {
 
 std::string GetWebKitVersion() {
@@ -162,4 +167,29 @@ void SetUserAgentOSInfo(const std::string& os_info) {
 }
 #endif
 
+std::string BuildUserAgentOverrideForTabletSiteFromUserAgent(
+    const std::string& user_agent) {
+  // Example: original user agent text:
+  //
+  //   Mozilla/5.0 (X11; CrOS x86_64 0.4.0)
+  //   AppleWebKit/537.2 (KHTML, like Gecko) Chrome/22.0.1211.0 Safari/537.2
+  //
+  // Copy & Edit to create user agent override text by replacing
+  //   the text within the first pair of "()". For example:
+  //
+  //   Mozilla/5.0 (Linux; Android 4.0.4; Galaxy Nexus Build/IMM76B)
+  //   AppleWebKit/537.2 (KHTML, like Gecko) Chrome/22.0.1211.0 Safari/537.2
+  //
+  size_t p1 = user_agent.find("(");
+  if (p1 != std::string::npos) {
+    size_t p2 = user_agent.find(")", p1);
+    if (p2 != std::string::npos) {
+      std::string ua_override(user_agent);
+      ua_override.replace(p1, p2-p1+1, kUserAgentOverrideForTabletSite);
+      return ua_override;
+    }
+  }
+  return std::string();
+}
+
 }  // namespace webkit_glue