[Crash Reporting] Implement a more direct bridge for extracting logcat output.

components/crash/android/BUILD.gn

+# Copyright 2017 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/rules.gni")
+
+_jni_sources =
+    [ "java/src/org/chromium/components/crash/browser/CrashDumpManager.java" ]
+
+generate_jni("jni_headers") {
+  sources = _jni_sources
+  jni_package = "crash"
+}
+
+android_library("java") {
+  deps = [
+    "//base:base_java",
+  ]
+  java_files = _jni_sources
+}
+
+android_library("javatests") {
+  testonly = true
+  deps = [
+    ":java",
+    "//base:base_java",
+    "//base:base_java_test_support",
+    "//third_party/android_support_test_runner:runner_java",
+    "//third_party/junit",
+  ]
+  java_files = [ "javatests/src/org/chromium/components/crash/browser/CrashDumpManagerTest.java" ]
+}