Add BlimpClientContext and factory with real and dummy implementation

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index e14c1d42920c3b11ccba77cfae9dec8c3992e513..ceeb5144506223159d70a03658d802b6a4a4576b 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//blimp/blimp.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
@@ -770,6 +771,7 @@ split_static_library("browser") {
       ":client_discourse_context_proto",
       ":delta_file_proto",
       ":jni_headers",
+      "//blimp/client/public",
       "//components/data_usage/android",
       "//components/precache/content",
       "//components/precache/core",
@@ -777,6 +779,12 @@ split_static_library("browser") {
       "//components/toolbar",
       "//components/web_contents_delegate_android",
     ]
+
+    if (enable_blimp) {
+      deps += [ "//blimp/client/core" ]
+    } else {
+      deps += [ "//blimp/client/dummy" ]
+    }
   }
 
   if (is_android) {