[WIP] Adding Mockito support in Android instrumentation tests

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 67f70c1eb1489bd2bf078811f8cd65d5d000b9cd..08bddecbbe114f8c20b778279297d57c896f6bfb 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -470,6 +470,8 @@ android_library("chrome_test_java") {
     "//third_party/hamcrest:hamcrest_java",
     "//third_party/jsr-305:jsr_305_javalib",
     "//third_party/junit",
+    "//third_party/mockito:mockito_android_java",
+    "//third_party/mockito:mockito_java",
     "//ui/android:ui_java",
     "//ui/android:ui_javatests",
     "//ui/base/mojo:mojo_bindings_java",
@@ -857,6 +859,9 @@ instrumentation_test_apk("chrome_public_test_apk") {
     "//net/android:net_test_support_apk",
   ]
   proguard_enabled = !is_java_debug
+  if (proguard_enabled) {
+    enable_multidex = true
+  }
 }
 
 if (enable_vr) {