[headless] Embed pak file into binary.

ui/base/resource/data_pack_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "ui/base/resource/data_pack.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 121 matching lines @@
   ASSERT_TRUE(pack.GetStringPiece(1, &data));
   EXPECT_EQ(0U, data.length());
   ASSERT_TRUE(pack.GetStringPiece(10, &data));
   EXPECT_EQ(0U, data.length());
 
   // Try looking up an invalid key.
   ASSERT_FALSE(pack.HasResource(140));
   ASSERT_FALSE(pack.GetStringPiece(140, &data));
 }
 
+TEST(DataPackTest, LoadFromBuffer) {
+  DataPack pack(SCALE_FACTOR_100P);
+
+  ASSERT_TRUE(pack.LoadFromBuffer(
+      base::StringPiece(kSamplePakContents, kSamplePakSize)));
+
+  base::StringPiece data;
+  ASSERT_TRUE(pack.HasResource(4));
+  ASSERT_TRUE(pack.GetStringPiece(4, &data));
+  EXPECT_EQ("this is id 4", data);
+  ASSERT_TRUE(pack.HasResource(6));
+  ASSERT_TRUE(pack.GetStringPiece(6, &data));
+  EXPECT_EQ("this is id 6", data);
+
+  // Try reading zero-length data blobs, just in case.
+  ASSERT_TRUE(pack.GetStringPiece(1, &data));
+  EXPECT_EQ(0U, data.length());
+  ASSERT_TRUE(pack.GetStringPiece(10, &data));
+  EXPECT_EQ(0U, data.length());
+
+  // Try looking up an invalid key.
+  ASSERT_FALSE(pack.HasResource(140));
+  ASSERT_FALSE(pack.GetStringPiece(140, &data));
+}
+
 INSTANTIATE_TEST_CASE_P(WriteBINARY, DataPackTest, ::testing::Values(
     DataPack::BINARY));
 INSTANTIATE_TEST_CASE_P(WriteUTF8, DataPackTest, ::testing::Values(
     DataPack::UTF8));
 INSTANTIATE_TEST_CASE_P(WriteUTF16, DataPackTest, ::testing::Values(
     DataPack::UTF16));
 
 TEST(DataPackTest, LoadFileWithTruncatedHeader) {
   base::FilePath data_path;
   ASSERT_TRUE(PathService::Get(UI_DIR_TEST_DATA, &data_path));
@@ skipping 65 matching lines @@
                             kSampleCorruptPakSize),
             static_cast<int>(kSampleCorruptPakSize));
 
   // Reading asset #10 should now fail as it extends past the end of the file.
   ASSERT_TRUE(pack.HasResource(10));
   ASSERT_FALSE(pack.GetStringPiece(10, &data));
 }
 #endif
 
 }  // namespace ui