Introduce ChromeVR to Chrome on Android (behind a build flag)

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index f4363175e032d5753a0b9f273b141fe6f91b2a63..f93b9e9ad65d6d23abe1ed7e1e53d2cc301433f7 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -246,6 +246,14 @@ android_library("chrome_java") {
       "//components/web_contents_delegate_android:web_contents_delegate_android_java",
     ]
   }
+
+  if (enable_vr_shell) {
+    java_files += chrome_vr_java_sources
+    deps += [
+      "//third_party/gvr-android-sdk:gvr_base_java",
+      "//third_party/gvr-android-sdk:gvr_common_java",
+    ]
+  }
 }
 
 # GYP: //chrome/chrome_browser.gypi:activity_type_ids_java
@@ -552,6 +560,11 @@ chrome_public_apk_tmpl_shared("chrome_public_apk") {
   deps = [
     ":chrome_public_apk_template_resources",
   ]
+
+  if (enable_vr_shell) {
+    deps += [ "//third_party/gvr-android-sdk:libgvr_shared_library" ]
+    loadable_modules = [ "$root_out_dir/libgvr.so" ]
+  }
 }
 
 chrome_public_apk_tmpl_shared("chrome_sync_shell_apk") {