Upstream the clipboard implementation for Android

base/android/jni_android.cc

Index: base/android/jni_android.cc
diff --git a/base/android/jni_android.cc b/base/android/jni_android.cc
index f99f1aba16677252e67b0c6e4268f14d0b397d71..9000e86bcaf372fd59f763d9b408df92bb64177b 100644
--- a/base/android/jni_android.cc
+++ b/base/android/jni_android.cc
@@ -157,13 +157,23 @@ jfieldID GetFieldID(JNIEnv* env,
   return id;
 }
 
-bool CheckException(JNIEnv* env) {
-  if (env->ExceptionCheck() == JNI_FALSE)
+bool HasException(JNIEnv* env) {
+  return env->ExceptionCheck() != JNI_FALSE;
+}
+
+bool ClearException(JNIEnv* env) {
+  if (!HasException(env))
     return false;
-  env->ExceptionDescribe();
   env->ExceptionClear();
   return true;
 }
 
+void CheckException(JNIEnv* env) {
+  if (HasException(env)) {
+    env->ExceptionDescribe();
+    CHECK(false);
+  }
+}
+
 }  // namespace android
 }  // namespace base