Increase the child process connection timeout for browser tests.

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 5973fc038ace93edd1e91d3625c99e68b5770d58..f10bed115cdf82f16d86e5c58dcaa548b5ca827a 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -604,6 +604,10 @@ const char kIgnoreGpuBlacklist[]            = "ignore-gpu-blacklist";
 // Run the GPU process as a thread in the browser process.
 const char kInProcessGPU[]                  = "in-process-gpu";
 
+// Overrides the timeout, in seconds, that a child process waits for a
+// connection from the browser before killing itself.
+const char kIPCConnectionTimeout[]          = "ipc-connection-timeout";
+
 // Specifies the flags passed to JS engine
 const char kJavaScriptFlags[]               = "js-flags";