Variations seed is pulled from the Java application on the first launch of Chrome

chrome/browser/android/preferences/pref_service_bridge.cc

Index: chrome/browser/android/preferences/pref_service_bridge.cc
diff --git a/chrome/browser/android/preferences/pref_service_bridge.cc b/chrome/browser/android/preferences/pref_service_bridge.cc
index 5b5f4b54ac3b2e812c18acfc28a2a45e8f9c3d3a..62b6f63f2e3aaa14f3a538d74f3ad7b79ba7515a 100644
--- a/chrome/browser/android/preferences/pref_service_bridge.cc
+++ b/chrome/browser/android/preferences/pref_service_bridge.cc
@@ -10,6 +10,7 @@
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/jni_weak_ref.h"
+#include "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/scoped_ptr.h"
@@ -36,6 +37,7 @@
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/translate/core/browser/translate_prefs.h"
 #include "components/translate/core/common/translate_pref_names.h"
+#include "components/variations/pref_names.h"
 #include "components/version_info/version_info.h"
 #include "components/web_resource/web_resource_pref_names.h"
 #include "content/public/browser/browser_thread.h"
@@ -47,6 +49,7 @@ using base::android::AttachCurrentThread;
 using base::android::CheckException;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
+using base::android::GetApplicationContext;
 using base::android::ScopedJavaLocalRef;
 using base::android::ScopedJavaGlobalRef;
 using content::BrowserThread;
@@ -948,3 +951,30 @@ std::string PrefServiceBridge::GetAndroidPermissionForContentSetting(
 
   return ConvertJavaStringToUTF8(android_permission);
 }
+
+//static

[Bernhard Bauer, 2015/10/30 09:56:08]

Space after //

[Alexander Agulenko, 2015/11/02 22:55:33]

Done.

+void PrefServiceBridge::GetVariationsFirstRunSeed(
+    std::string* seed_data,
+    std::string* seed_signature,
+    std::string* seed_country) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jbyteArray> j_seed_data =
+    Java_PrefServiceBridge_getVariationsFirstRunSeedData(
+      env, GetApplicationContext());
+  ScopedJavaLocalRef<jstring> j_seed_signature =
+      Java_PrefServiceBridge_getVariationsFirstRunSeedSignature(
+        env, GetApplicationContext());
+  ScopedJavaLocalRef<jstring> j_seed_country =
+      Java_PrefServiceBridge_getVariationsFirstRunSeedCountry(
+        env, GetApplicationContext());
+  std::string seed;
+  if (!j_seed_data.is_null()) {
+    int array_length = env->GetArrayLength(j_seed_data.obj());
+    seed.resize(array_length);
+    env->GetByteArrayRegion(j_seed_data.obj(), 0, array_length,
+                          reinterpret_cast<jbyte*>(&(seed[0])));

[Alexei Svitkine (slow), 2015/10/29 15:04:12]

Can you make a helper similar to
https://code.google.com/p/chromium/codesearch#chromium/src/base/android/jni_a...
for this?

[Alexander Agulenko, 2015/11/02 22:55:33]

Done.

+  }
+  seed_data->swap(seed);
+  *seed_signature = ConvertJavaStringToUTF8(j_seed_signature);
+  *seed_country = ConvertJavaStringToUTF8(j_seed_country);
+}