Properly throw java exceptions from shouldOverrideUrlLoading

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 1ab2217a02fdc0b269339adcf4daddc405b429eb..38fa9949324b88ce5c9eb4319143e3f67033aa2e 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -177,6 +177,7 @@ component("base") {
     "android/important_file_writer_android.h",
     "android/java_handler_thread.cc",
     "android/java_handler_thread.h",
+    "android/java_message_handler_factory.h",
     "android/java_runtime.cc",
     "android/java_runtime.h",
     "android/jni_android.cc",
@@ -2017,8 +2018,8 @@ test("base_unittests") {
     ":base",
     ":i18n",
     ":message_loop_tests",
+    "//base:run_all_base_unittests",
     "//base/allocator:features",
-    "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//base/third_party/dynamic_annotations",
     "//testing/gmock",
@@ -2194,6 +2195,16 @@ if (enable_nocompile_tests) {
   }
 }
 
+static_library("run_all_base_unittests") {
+  testonly = true
+  sources = [
+    "run_all_base_unittests.cc",
+  ]
+  deps = [
+    "//base/test:test_support",
+  ]
+}
+
 if (is_android) {
   # GYP: //base.gyp:base_jni_headers
   generate_jni("base_jni_headers") {
@@ -2459,7 +2470,9 @@ if (is_android) {
     deps = [
       ":base_java",
     ]
-    java_files =
-        [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
+    java_files = [
+      "test/android/java/src/org/chromium/base/ContentUriTestUtils.java",
+      "test/android/java/src/org/chromium/base/TestSystemMessageHandler.java",
+    ]
   }
 }