Add BlimpClientContext and factory with real and dummy implementation

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 75e6228e2541b9821dac54a3102a817da1ac3dc7..426a12b1527153272e4f0bbacc2df9ed73010635 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/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/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build_overrides/v8.gni")
@@ -14,11 +15,6 @@ import("//third_party/protobuf/proto_library.gni")
 import("channel.gni")
 import("java_sources.gni")
 
-declare_args() {
-  # Enables blimp for android.
-  enable_blimp = false
-}
-
 manifest_package = "org.chromium.chrome"
 
 chrome_public_jinja_variables = default_chrome_public_jinja_variables +
@@ -227,6 +223,7 @@ android_library("chrome_java") {
     deps += [
       ":chrome_java_resources",
       ":document_tab_model_info_proto_java",
+      "//blimp/client/public:public_java",
       "//components/bookmarks/common/android:bookmarks_java",
       "//components/dom_distiller/android:dom_distiller_content_java",
       "//components/dom_distiller/android:dom_distiller_core_java",
@@ -242,6 +239,12 @@ android_library("chrome_java") {
       "//components/web_contents_delegate_android:web_contents_delegate_android_java",
       "//sync/android:sync_java",
     ]
+
+    if (enable_blimp) {
+      deps += [ "//blimp/client/core:core_java" ]
+    } else {
+      deps += [ "//blimp/client/dummy:dummy_java" ]
+    }
   }
 }