Add pdf_unittests target.

pdf/BUILD.gn

 # Copyright 2014 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/features.gni")
+import("//testing/test.gni")
 import("//third_party/pdfium/pdfium.gni")
 
 assert(enable_pdf)
 
 pdf_engine = 0  # 0 PDFium
 
 static_library("pdf") {
   deps = [
     "//base",
     "//gin",
@@ skipping 47 matching lines @@
       "pdfium/pdfium_range.cc",
       "pdfium/pdfium_range.h",
     ]
   }
 
   defines = [ "PDFIUM_PRINT_TEXT_WITH_GDI" ]
   if (pdf_enable_xfa) {
     defines += [ "PDF_ENABLE_XFA" ]
   }
 }
+
+test("pdf_unittests") {
+  sources = [
+    "chunk_stream_unittest.cc",
+    "run_all_unittests.cc",
+  ]
+
+  deps = [
+    ":pdf",
+    "//base",
+    "//base/test:test_support",
+    "//ppapi/c",
+    "//ppapi/cpp",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}