Initial CL for talking to the WebAPK server to generate WebAPK

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 36d302302c40177a80717f11d0ad886e9502c736..415a4e0d5bf1d72aee23b12e616f3eda7d9464b5 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1057,6 +1057,9 @@ const char kV8PacMojoOutOfProcess[] = "v8-pac-mojo-out-of-process";
 // Prints version information and quits.
 const char kVersion[]                       = "version";
 
+// Custom WebAPK server URL for the sake of testing.
+const char kWebApkServerUrl[]               = "webapk-server-url";
+
 // Specify the initial window position: --window-position=x,y
 const char kWindowPosition[]                = "window-position";