Add BlimpClientContext and factory with real and dummy implementation

chrome/android/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build_overrides/v8.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
 import("//testing/test.gni")
 import("//third_party/icu/config.gni")
 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 +
                                 [ "manifest_package=$manifest_package" ]
 
 chrome_sync_shell_jinja_variables =
     default_chrome_public_jinja_variables +
     [ "manifest_package=org.chromium.chrome.sync_shell" ]
 
 chrome_apk_gypi = exec_script("//build/gypi_to_gn.py",
@@ skipping 188 matching lines @@
       "//components/offline_pages:offline_page_model_enums_java",
       "//components/omnibox/browser:autocomplete_match_javagen",
       "//components/omnibox/browser:autocomplete_match_type_javagen",
       "//components/security_state:security_state_enums_java",
       "//components/signin/core/browser:investigated_scenario_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",
       "//components/gcm_driver/android:gcm_driver_java",
       "//components/gcm_driver/instance_id/android:instance_id_driver_java",
       "//components/invalidation/impl:java",
       "//components/location/android:location_java",
       "//components/navigation_interception/android:navigation_interception_java",
       "//components/policy/android:policy_java",
       "//components/precache/android:precache_java",
@@ skipping 366 matching lines @@
     apk_name = "ChromeSyncShellTest"
     apk_under_test = ":chrome_sync_shell_apk"
     android_manifest = chrome_sync_shell_test_apk_manifest
     android_manifest_dep = ":chrome_sync_shell_test_apk_manifest"
     deps = [
       ":chrome_sync_shell_test_apk_java",
     ]
     proguard_enabled = !is_java_debug
   }
 }