Add CDM FileIO tests.

- Add CdmFileIOTest, which tests CdmFileIO in ClearKeyCdm.
- Update EncryptedMediaTest to check the result of CdmFileIOTest.

BUG=324134
TEST=Tests added pass on Linux.

Review URL: https://codereview.chromium.org/93243003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242027 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 719 insertions, 19 deletions

diff --git a/chrome/browser/media/encrypted_media_browsertest.cc b/chrome/browser/media/encrypted_media_browsertest.cc
index 14ebbb0..bedf5b4 100644
--- a/chrome/browser/media/encrypted_media_browsertest.cc
+++ b/chrome/browser/media/encrypted_media_browsertest.cc
@@ -36,6 +36,8 @@ const char kClearKeyKeySystem[] = "webkit-org.w3.clearkey";
 const char kExternalClearKeyKeySystem[] = "org.chromium.externalclearkey";
 const char kExternalClearKeyDecryptOnlyKeySystem[] =
     "org.chromium.externalclearkey.decryptonly";
+const char kExternalClearKeyFileIOTestKeySystem[] =
+    "org.chromium.externalclearkey.fileiotest";
 const char kExternalClearKeyInitializeFailKeySystem[] =
     "org.chromium.externalclearkey.initializefail";
 
@@ -51,6 +53,7 @@ const char kMP4VideoOnly[] = "video/mp4; codecs=\"avc1.4D4041\"";
 // EME-specific test results and errors.
 const char kEmeKeyError[] = "KEYERROR";
 const char kEmeNotSupportedError[] = "NOTSUPPORTEDERROR";
+const char kFileIOTestSuccess[] = "FILEIOTESTSUCCESS";
 
 // The type of video src used to load media.
 enum SrcType {
@@ -388,8 +391,7 @@ IN_PROC_BROWSER_TEST_F(WVEncryptedMediaTest, ParentThrowsException) {
 #endif  // defined(WIDEVINE_CDM_AVAILABLE)
 
 #if defined(ENABLE_PEPPER_CDMS)
-IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest,
-                       ExternalClearKeyInitializeCDMFail) {
+IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, InitializeCDMFail) {
   RunEncryptedMediaTest("encrypted_media_player.html",
                         "bear-a-enc_a.webm",
                         kWebMAudioOnly,
@@ -397,4 +399,13 @@ IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest,
                         SRC,
                         kEmeKeyError);
 }
+
+IN_PROC_BROWSER_TEST_F(ECKEncryptedMediaTest, FileIOTest) {
+  RunEncryptedMediaTest("encrypted_media_player.html",
+                        "bear-a-enc_a.webm",
+                        kWebMAudioOnly,
+                        kExternalClearKeyFileIOTestKeySystem,
+                        SRC,
+                        kFileIOTestSuccess);
+}
 #endif  // defined(ENABLE_PEPPER_CDMS)
diff --git a/chrome/renderer/media/chrome_key_systems.cc b/chrome/renderer/media/chrome_key_systems.cc
index 2b4ba65..bb59fae 100644
--- a/chrome/renderer/media/chrome_key_systems.cc
+++ b/chrome/renderer/media/chrome_key_systems.cc
@@ -66,6 +66,8 @@ static void AddExternalClearKey(
       "org.chromium.externalclearkey";
   static const char kExternalClearKeyDecryptOnlyKeySystem[] =
       "org.chromium.externalclearkey.decryptonly";
+  static const char kExternalClearKeyFileIOTestKeySystem[] =
+      "org.chromium.externalclearkey.fileiotest";
   static const char kExternalClearKeyInitializeFailKeySystem[] =
       "org.chromium.externalclearkey.initializefail";
   static const char kExternalClearKeyPepperType[] =
@@ -91,15 +93,19 @@ static void AddExternalClearKey(
 
   concrete_key_systems->push_back(info);
 
+  // Add support of decrypt-only mode in ClearKeyCdm.
+  info.key_system = kExternalClearKeyDecryptOnlyKeySystem;
+  concrete_key_systems->push_back(info);
+
+  // A key system that triggers FileIO test in ClearKeyCdm.
+  info.key_system = kExternalClearKeyFileIOTestKeySystem;
+  concrete_key_systems->push_back(info);
+
   // A key system that Chrome thinks is supported by ClearKeyCdm, but actually
   // will be refused by ClearKeyCdm. This is to test the CDM initialization
   // failure case.
   info.key_system = kExternalClearKeyInitializeFailKeySystem;
   concrete_key_systems->push_back(info);
-
-  // Add support of decrypt-only mode in ClearKeyCdm.
-  info.key_system = kExternalClearKeyDecryptOnlyKeySystem;
-  concrete_key_systems->push_back(info);
 }
 #endif  // defined(ENABLE_PEPPER_CDMS)
 
diff --git a/chrome/test/data/media/encrypted_media_utils.js b/chrome/test/data/media/encrypted_media_utils.js
index 3486197..2848052 100644
--- a/chrome/test/data/media/encrypted_media_utils.js
+++ b/chrome/test/data/media/encrypted_media_utils.js
@@ -14,21 +14,32 @@ var KEY = new Uint8Array([0xeb, 0xdd, 0x62, 0xf1, 0x68, 0x14, 0xd2, 0x7b,
 var KEY_ID = getInitDataFromKeyId("0123456789012345");
 // Heart beat message header.
 var HEART_BEAT_HEADER = 'HEARTBEAT';
+var FILE_IO_TEST_RESULT_HEADER = 'FILEIOTESTRESULT';
 var EXTERNAL_CLEAR_KEY_KEY_SYSTEM = "org.chromium.externalclearkey";
+var EXTERNAL_CLEAR_KEY_FILE_IO_TEST_KEY_SYSTEM =
+    "org.chromium.externalclearkey.fileiotest";
 // Note that his URL has been normalized from the one in clear_key_cdm.cc.
 var EXTERNAL_CLEAR_KEY_HEARTBEAT_URL =
     'http://test.externalclearkey.chromium.org/';
 
-function isHeartbeatMessage(msg) {
-  if (msg.length < HEART_BEAT_HEADER.length)
+function hasPrefix(msg, prefix) {
+  if (msg.length < prefix.length)
     return false;
-  for (var i = 0; i < HEART_BEAT_HEADER.length; ++i) {
-    if (String.fromCharCode(msg[i]) != HEART_BEAT_HEADER[i])
+  for (var i = 0; i < prefix.length; ++i) {
+    if (String.fromCharCode(msg[i]) != prefix[i])
       return false;
   }
   return true;
 }
 
+function isHeartbeatMessage(msg) {
+  return hasPrefix(msg, HEART_BEAT_HEADER);
+}
+
+function isFileIOTestMessage(msg) {
+  return hasPrefix(msg, FILE_IO_TEST_RESULT_HEADER);
+}
+
 function loadEncryptedMediaFromURL(video) {
   return loadEncryptedMedia(video, mediaFile, keySystem, KEY, useMSE);
 }
@@ -89,6 +100,21 @@ function loadEncryptedMedia(video, mediaFile, keySystem, key, useMSE,
       return;
     }
 
+    if (isFileIOTestMessage(e.message)) {
+      var success = getFileIOTestResult(e);
+      console.log('onKeyMessage - CDM file IO test: ' +
+                  (success ? 'Success' : 'Fail'));
+      if (success)
+        setResultInTitle("FILEIOTESTSUCCESS");
+      else
+        setResultInTitle("FAILED");
+      return;
+    }
+
+    // For FileIOTest key system, no need to start playback.
+    if (e.keySystem == EXTERNAL_CLEAR_KEY_FILE_IO_TEST_KEY_SYSTEM)
+      return;
+
     // No tested key system returns defaultURL in for key request messages.
     if (e.defaultURL) {
       failTest('keymessage unexpectedly has defaultURL: ' + e.defaultURL);
@@ -125,6 +151,21 @@ function loadEncryptedMedia(video, mediaFile, keySystem, key, useMSE,
     }
   }
 
+  function getFileIOTestResult(e) {
+    // Only External Clear Key sends a FILEIOTESTRESULT message.
+    if (e.keySystem != EXTERNAL_CLEAR_KEY_FILE_IO_TEST_KEY_SYSTEM) {
+      failTest('Unexpected CDM file IO test result from ' + e.keySystem);
+      return false;
+    }
+
+    // The test result is either '0' or '1' appended to the header.
+    if (e.message.length != FILE_IO_TEST_RESULT_HEADER.length + 1)
+      return false;
+
+    var result_index = FILE_IO_TEST_RESULT_HEADER.length;
+    return String.fromCharCode(e.message[result_index]) == 1;
+  }
+
   video.addEventListener('webkitneedkey', onNeedKey);
   video.addEventListener('webkitkeymessage', onKeyMessage);
   video.addEventListener('webkitkeyerror', function() {
diff --git a/media/cdm/ppapi/cdm_file_io_test.cc b/media/cdm/ppapi/cdm_file_io_test.cc
new file mode 100644
index 0000000..5bbcd8e
--- /dev/null
+++ b/media/cdm/ppapi/cdm_file_io_test.cc
@@ -0,0 +1,437 @@
+// Copyright 2013 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 "media/cdm/ppapi/cdm_file_io_test.h"
+
+#include "base/bind.h"
+#include "base/callback_helpers.h"
+#include "base/logging.h"
+
+namespace media {
+
+#define FILE_IO_DVLOG(level) DVLOG(level) << "File IO Test: "
+
+const uint8 kData[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+                        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
+const uint32 kDataSize = arraysize(kData);
+
+const uint8 kBigData[] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+                           0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff,
+                           0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+                           0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff,
+                           0x00 };
+const uint32 kBigDataSize = arraysize(kBigData);
+
+// Must be > kReadSize in cdm_file_io_impl.cc.
+const uint32 kLargeDataSize = 9 * 1024 + 7;
+
+// Macros to help add test cases/steps.
+#define START_TEST_CASE(test_name)                                     \
+  do {                                                                 \
+    FileIOTest test_case(create_file_io_cb_, "FileIOTest." test_name); \
+    CREATE_FILE_IO  // Create FileIO for each test case.
+
+#define ADD_TEST_STEP(type, status, data, data_size)                   \
+    test_case.AddTestStep(FileIOTest::type, cdm::FileIOClient::status, \
+                          (data), (data_size));
+
+#define END_TEST_CASE                 \
+    remaining_tests_.push_back(test_case); \
+  } while(0);
+
+#define CREATE_FILE_IO \
+  ADD_TEST_STEP(ACTION_CREATE, kSuccess, NULL, 0)
+
+#define OPEN_FILE \
+  ADD_TEST_STEP(ACTION_OPEN, kSuccess, NULL, 0)
+
+#define EXPECT_FILE_OPENED(status) \
+  ADD_TEST_STEP(RESULT_OPEN, status, NULL, 0)
+
+#define READ_FILE \
+  ADD_TEST_STEP(ACTION_READ, kSuccess, NULL, 0)
+
+#define EXPECT_FILE_READ(status, data, data_size) \
+  ADD_TEST_STEP(RESULT_READ, status, data, data_size)
+
+#define WRITE_FILE(data, data_size) \
+  ADD_TEST_STEP(ACTION_WRITE, kSuccess, data, data_size)
+
+#define EXPECT_FILE_WRITTEN(status) \
+  ADD_TEST_STEP(RESULT_WRITE, status, NULL, 0)
+
+#define CLOSE_FILE \
+  ADD_TEST_STEP(ACTION_CLOSE, kSuccess, NULL, 0)
+
+// FileIOTestRunner implementation.
+
+FileIOTestRunner::FileIOTestRunner(const CreateFileIOCB& create_file_io_cb)
+    : create_file_io_cb_(create_file_io_cb),
+      total_num_tests_(0),
+      num_passed_tests_(0) {
+  // Generate |large_data_|.
+  large_data_.resize(kLargeDataSize);
+  for (size_t i = 0; i < kLargeDataSize; ++i)
+    large_data_[i] = i % kuint8max;
+
+  AddTests();
+}
+
+FileIOTestRunner::~FileIOTestRunner() {
+  if (remaining_tests_.empty())
+    return;
+
+  DCHECK_LT(num_passed_tests_, total_num_tests_);
+  FILE_IO_DVLOG(1) << "Not Finished (probably due to timeout). "
+                   << num_passed_tests_ << " passed in "
+                   << total_num_tests_ << " tests.";
+}
+
+// Note: Consecutive expectations (EXPECT*) can happen in any order.
+void FileIOTestRunner::AddTests() {
+  START_TEST_CASE("ReadBeforeOpeningFile")
+    READ_FILE
+    EXPECT_FILE_READ(kError, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteBeforeOpeningFile")
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kError)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReadBeforeFileOpened")
+    OPEN_FILE
+    READ_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    EXPECT_FILE_READ(kError, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteBeforeFileOpened")
+    OPEN_FILE
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kError)
+    EXPECT_FILE_OPENED(kSuccess)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReadDuringPendingRead")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    READ_FILE
+    EXPECT_FILE_READ(kInUse, NULL, 0)
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReadDuringPendingWrite")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    READ_FILE
+    EXPECT_FILE_READ(kInUse, NULL, 0)
+    EXPECT_FILE_WRITTEN(kSuccess)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteDuringPendingRead")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    READ_FILE
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kInUse)
+    EXPECT_FILE_READ(kSuccess, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteDuringPendingWrite")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    WRITE_FILE(kBigData, kBigDataSize)
+    EXPECT_FILE_WRITTEN(kInUse)
+    EXPECT_FILE_WRITTEN(kSuccess)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReadEmptyFile")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteAndRead")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteZeroBytes")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(NULL, 0)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("WriteAndReadLargeData")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(&large_data_[0], kLargeDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, &large_data_[0], kLargeDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("OverwriteZeroBytes")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+    WRITE_FILE(NULL, 0)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, NULL, 0)
+  END_TEST_CASE
+
+  START_TEST_CASE("OverwriteWithSmallerData")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kBigData, kBigDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("OverwriteWithLargerData")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    WRITE_FILE(kBigData, kBigDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kBigData, kBigDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReadExistingFile")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    CLOSE_FILE
+    CREATE_FILE_IO
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+  END_TEST_CASE
+
+  START_TEST_CASE("ReopenFileInTheSameFileIO")
+    OPEN_FILE
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kError)  // The second Open() failed.
+    EXPECT_FILE_OPENED(kSuccess)  // The first Open() succeeded.
+  END_TEST_CASE
+
+  // TODO(xhwang): This test should fail. But pp::FileIO doesn't support locking
+  // of opened files. We need to either workaround this or fix pp::FileIO
+  // implementation.
+  START_TEST_CASE("ReopenFileInSeparateFileIO")
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    WRITE_FILE(kData, kDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+    CREATE_FILE_IO  // Create a second FileIO without closing the first one.
+    OPEN_FILE
+    EXPECT_FILE_OPENED(kSuccess)
+    READ_FILE
+    EXPECT_FILE_READ(kSuccess, kData, kDataSize)
+    WRITE_FILE(kBigData, kBigDataSize)
+    EXPECT_FILE_WRITTEN(kSuccess)
+  END_TEST_CASE
+}
+
+void FileIOTestRunner::RunAllTests(const CompletionCB& completion_cb) {
+  completion_cb_ = completion_cb;
+  total_num_tests_ = remaining_tests_.size();
+  RunNextTest();
+}
+
+void FileIOTestRunner::RunNextTest() {
+  if (remaining_tests_.empty()) {
+    FILE_IO_DVLOG(1) << num_passed_tests_ << " passed and "
+                     << (total_num_tests_ - num_passed_tests_) << " failed in "
+                     << total_num_tests_ << " tests.";
+    bool success = (num_passed_tests_ == total_num_tests_);
+    base::ResetAndReturn(&completion_cb_).Run(success);
+    return;
+  }
+
+  remaining_tests_.front().Run(
+      base::Bind(&FileIOTestRunner::OnTestComplete, base::Unretained(this)));
+}
+
+void FileIOTestRunner::OnTestComplete(bool success) {
+  if (success)
+    num_passed_tests_++;
+  remaining_tests_.pop_front();
+  RunNextTest();
+}
+
+// FileIOTest implementation.
+
+FileIOTest::FileIOTest(const CreateFileIOCB& create_file_io_cb,
+                       const std::string& test_name)
+    : create_file_io_cb_(create_file_io_cb),
+      test_name_(test_name) {}
+
+FileIOTest::~FileIOTest() {}
+
+void FileIOTest::AddTestStep(
+    StepType type, Status status, const uint8* data, uint32 data_size) {
+  test_steps_.push_back(TestStep(type, status, data, data_size));
+}
+
+void FileIOTest::Run(const CompletionCB& completion_cb) {
+  FILE_IO_DVLOG(3) << "Run " << test_name_;
+  completion_cb_ = completion_cb;
+  DCHECK(!test_steps_.empty() && !IsResult(test_steps_.front()));
+  RunNextStep();
+}
+
+void FileIOTest::OnOpenComplete(Status status) {
+  OnResult(TestStep(RESULT_OPEN, status, NULL, 0));
+}
+
+void FileIOTest::OnReadComplete(Status status,
+                                const uint8_t* data,
+                                uint32_t data_size) {
+  OnResult(TestStep(RESULT_READ, status, data, data_size));
+}
+
+void FileIOTest::OnWriteComplete(Status status) {
+  OnResult(TestStep(RESULT_WRITE, status, NULL, 0));
+}
+
+bool FileIOTest::IsResult(const TestStep& test_step) {
+  switch (test_step.type) {
+    case RESULT_OPEN:
+    case RESULT_READ:
+    case RESULT_WRITE:
+      return true;
+    case ACTION_CREATE:
+    case ACTION_OPEN:
+    case ACTION_READ:
+    case ACTION_WRITE:
+    case ACTION_CLOSE:
+      return false;
+  }
+  NOTREACHED();
+  return false;
+}
+
+bool FileIOTest::MatchesResult(const TestStep& a, const TestStep& b) {
+  DCHECK(IsResult(a) && IsResult(b));
+  if (a.type != b.type || a.status != b.status)
+    return false;
+
+  if (a.type != RESULT_READ || a.status != cdm::FileIOClient::kSuccess)
+    return true;
+
+  return (a.data_size == a.data_size &&
+          std::equal(a.data, a.data + a.data_size, b.data));
+}
+
+void FileIOTest::RunNextStep() {
+  // Run all actions in the current action group.
+  while (!test_steps_.empty()) {
+    // Start to wait for test results when the next step is a test result.
+    if (IsResult(test_steps_.front()))
+      return;
+
+    TestStep test_step = test_steps_.front();
+    test_steps_.pop_front();
+
+    cdm::FileIO* file_io = file_io_stack_.empty()? NULL : file_io_stack_.top();
+
+    switch (test_step.type) {
+      case ACTION_CREATE:
+        file_io = create_file_io_cb_.Run(this);
+        if (!file_io) {
+          FILE_IO_DVLOG(3) << "Cannot create FileIO object.";
+          OnTestComplete(false);
+          return;
+        }
+        file_io_stack_.push(file_io);
+        break;
+      case ACTION_OPEN:
+        // Use test name as the test file name.
+        file_io->Open(test_name_.data(), test_name_.size());
+        break;
+      case ACTION_READ:
+        file_io->Read();
+        break;
+      case ACTION_WRITE:
+        file_io->Write(test_step.data, test_step.data_size);
+        break;
+      case ACTION_CLOSE:
+        file_io->Close();
+        file_io_stack_.pop();
+        break;
+      default:
+        NOTREACHED();
+    }
+  }
+
+  OnTestComplete(true);
+}
+
+void FileIOTest::OnResult(const TestStep& result) {
+  DCHECK(IsResult(result));
+  if (!CheckResult(result)) {
+    OnTestComplete(false);
+    return;
+  }
+
+  RunNextStep();
+}
+
+bool FileIOTest::CheckResult(const TestStep& result) {
+  if (test_steps_.empty() || !IsResult(test_steps_.front()))
+    return false;
+
+  // If there are multiple results expected, the order does not matter.
+  std::list<TestStep>::iterator iter = test_steps_.begin();
+  for (; iter != test_steps_.end(); ++iter) {
+    if (!IsResult(*iter))
+      return false;
+
+    if (!MatchesResult(*iter, result))
+      continue;
+
+    test_steps_.erase(iter);
+    return true;
+  }
+
+  return false;
+}
+
+void FileIOTest::OnTestComplete(bool success) {
+  while (!file_io_stack_.empty()) {
+    cdm::FileIO* file_io = file_io_stack_.top();
+    file_io->Close();
+    file_io_stack_.pop();
+  }
+  FILE_IO_DVLOG(3) << test_name_ << (success ? " PASSED" : " FAILED");
+  base::ResetAndReturn(&completion_cb_).Run(success);
+}
+
+}  // namespace media
diff --git a/media/cdm/ppapi/cdm_file_io_test.h b/media/cdm/ppapi/cdm_file_io_test.h
new file mode 100644
index 0000000..3e0060c
--- /dev/null
+++ b/media/cdm/ppapi/cdm_file_io_test.h
@@ -0,0 +1,157 @@
+// Copyright 2013 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.
+
+#ifndef MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_
+#define MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_
+
+#include <list>
+#include <stack>
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "media/cdm/ppapi/api/content_decryption_module.h"
+
+namespace media {
+
+typedef base::Callback<void(bool success)> CompletionCB;
+typedef base::Callback<cdm::FileIO*(cdm::FileIOClient* client)> CreateFileIOCB;
+
+// A customizable test class that tests cdm::FileIO implementation.
+// - To create a test, call AddTestStep() to add a test step. A test step can be
+//   either an action to make (use ACTION_* types), or a result to verify (use
+//   RESULT_* types).
+// - To run the test, simply call Run() with a completion callback. The result
+//   will be reported in the completion callback when the test is finished.
+//
+// The following rules apply to the test steps:
+// - Test steps are ordered (with the exception that results in a result group
+//   is not ordered).
+// - Consecutive action steps form an "action group". Consecutively result
+//   steps form a "result group". An action group is followed by a result
+//   group and vice versa.
+// - A test must start with an action group.
+// - To process an action group, the test runner runs (and clears) all steps
+//   in the group in the order they were added. Then it waits for test
+//   results.
+// - When a cdm::FileIOClient method is called, the test runner compares the
+//   result with all results in the current result group. If no result in that
+//   group matches the test result, the test fails. Otherwise, the matching
+//   result is cleared from the group. If the group is empty, the test runner
+//   starts to process the next action group. Otherwise, the test runner keeps
+//   waiting for the next test result.
+// - After all steps are cleared, the test passes.
+class FileIOTest : public cdm::FileIOClient {
+ public:
+  // Types of allowed test steps:
+  // - ACTION_* specifies the next step to test.
+  // - RESULT_* specifies the expected result of the previous step(s).
+  enum StepType {
+    ACTION_CREATE,
+    ACTION_OPEN,  // |test_name_| will be used used as the file name to open.
+    RESULT_OPEN,
+    ACTION_READ,
+    RESULT_READ,
+    ACTION_WRITE,
+    RESULT_WRITE,
+    ACTION_CLOSE  // If ACTION_CLOSE is not specified, FileIO::Close() will be
+                  // automatically called at the end of the test.
+  };
+
+  FileIOTest(const CreateFileIOCB& create_file_io_cb,
+             const std::string& test_name);
+  ~FileIOTest();
+
+  // Adds a test step in this test. |this| object doesn't take the ownership of
+  // |data|, which should be valid throughout the lifetime of |this| object.
+  void AddTestStep(
+      StepType type, Status status, const uint8* data, uint32 data_size);
+
+  // Runs this test case and returns the test result through |completion_cb|.
+  void Run(const CompletionCB& completion_cb);
+
+ private:
+  struct TestStep {
+    // |this| object doesn't take the ownership of |data|, which should be valid
+    // throughout the lifetime of |this| object.
+    TestStep(StepType type, Status status, const uint8* data, uint32 data_size)
+        : type(type), status(status), data(data), data_size(data_size) {}
+
+    StepType type;
+
+    // Expected status for RESULT* steps.
+    Status status;
+
+    // Data to write in ACTION_WRITE, or read data in RESULT_READ.
+    const uint8* data;
+    uint32 data_size;
+  };
+
+  // Returns whether |test_step| is a RESULT_* step.
+  static bool IsResult(const TestStep& test_step);
+
+  // Returns whether two results match.
+  static bool MatchesResult(const TestStep& a, const TestStep& b);
+
+  // cdm::FileIOClient implementation.
+  virtual void OnOpenComplete(Status status) OVERRIDE;
+  virtual void OnReadComplete(Status status,
+                              const uint8_t* data,
+                              uint32_t data_size) OVERRIDE;
+  virtual void OnWriteComplete(Status status) OVERRIDE;
+
+  // Runs the next step in this test case.
+  void RunNextStep();
+
+  void OnResult(const TestStep& result);
+
+  // Checks whether the test result matches this step. This can only be called
+  // when this step is a RESULT_* step.
+  bool CheckResult(const TestStep& result);
+
+  void OnTestComplete(bool success);
+
+  CreateFileIOCB create_file_io_cb_;
+  CompletionCB completion_cb_;
+
+  std::string test_name_;
+  std::list<TestStep> test_steps_;
+
+  // All opened cdm::FileIO objects. We keep multiple cdm::FileIO objects open
+  // so that we can test multiple cdm::FileIO objects accessing the same file.
+  // In the current implementation, all ACTION_* are performed on the latest
+  // opened cdm::FileIO object, hence the stack.
+  std::stack<cdm::FileIO*> file_io_stack_;
+};
+
+// Tests cdm::FileIO implementation.
+class FileIOTestRunner {
+ public:
+  explicit FileIOTestRunner(const CreateFileIOCB& create_file_io_cb);
+  ~FileIOTestRunner();
+
+  void AddTests();
+
+  // Run all tests. When tests are completed, the result will be reported in the
+  // |completion_cb|.
+  void RunAllTests(const CompletionCB& completion_cb);
+
+ private:
+  void OnTestComplete(bool success);
+  void RunNextTest();
+
+  CreateFileIOCB create_file_io_cb_;
+  CompletionCB completion_cb_;
+  std::list<FileIOTest> remaining_tests_;
+  std::vector<uint8> large_data_;
+  size_t total_num_tests_;  // Total number of tests.
+  size_t num_passed_tests_;  // Number of passed tests.
+
+  DISALLOW_COPY_AND_ASSIGN (FileIOTestRunner);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_
diff --git a/media/cdm/ppapi/clear_key_cdm.cc b/media/cdm/ppapi/clear_key_cdm.cc
index 16a00a5..ea89e82 100644
--- a/media/cdm/ppapi/clear_key_cdm.cc
+++ b/media/cdm/ppapi/clear_key_cdm.cc
@@ -15,6 +15,7 @@
 #include "base/time/time.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decrypt_config.h"
+#include "media/cdm/ppapi/cdm_file_io_test.h"
 #include "media/cdm/ppapi/cdm_video_decoder.h"
 
 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
@@ -63,6 +64,8 @@ const char kClearKeyCdmVersion[] = "0.1.0.1";
 const char kExternalClearKeyKeySystem[] = "org.chromium.externalclearkey";
 const char kExternalClearKeyDecryptOnlyKeySystem[] =
     "org.chromium.externalclearkey.decryptonly";
+const char kExternalClearKeyFileIOTestKeySystem[] =
+    "org.chromium.externalclearkey.fileiotest";
 const int64 kSecondsPerMinute = 60;
 const int64 kMsPerSecond = 1000;
 const int64 kInitialTimerDelayMs = 200;
@@ -70,6 +73,8 @@ const int64 kMaxTimerDelayMs = 1 * kSecondsPerMinute * kMsPerSecond;
 // Heart beat message header. If a key message starts with |kHeartBeatHeader|,
 // it's a heart beat message. Otherwise, it's a key request.
 const char kHeartBeatHeader[] = "HEARTBEAT";
+// CDM file IO test result header.
+const char kFileIOTestResultHeader[] = "FILEIOTESTRESULT";
 
 // Copies |input_buffer| into a media::DecoderBuffer. If the |input_buffer| is
 // empty, an empty (end-of-stream) media::DecoderBuffer is returned.
@@ -107,6 +112,12 @@ static scoped_refptr<media::DecoderBuffer> CopyDecoderBufferFrom(
   return output_buffer;
 }
 
+static std::string GetFileIOTestResultMessage(bool success) {
+  std::string message(kFileIOTestResultHeader);
+  message += success ? '1' : '0';
+  return message;
+}
+
 template<typename Type>
 class ScopedResetter {
  public:
@@ -135,7 +146,8 @@ void* CreateCdmInstance(int cdm_interface_version,
 
   std::string key_system_string(key_system, key_system_size);
   if (key_system_string != kExternalClearKeyKeySystem &&
-      key_system_string != kExternalClearKeyDecryptOnlyKeySystem) {
+      key_system_string != kExternalClearKeyDecryptOnlyKeySystem &&
+      key_system_string != kExternalClearKeyFileIOTestKeySystem) {
     DVLOG(1) << "Unsupported key system:" << key_system_string;
     return NULL;
   }
@@ -149,7 +161,9 @@ void* CreateCdmInstance(int cdm_interface_version,
     return NULL;
 
   return new media::ClearKeyCdm(
-      host, key_system_string == kExternalClearKeyDecryptOnlyKeySystem);
+      host,
+      key_system_string == kExternalClearKeyDecryptOnlyKeySystem,
+      key_system_string == kExternalClearKeyFileIOTestKeySystem);
 }
 
 const char* GetCdmVersion() {
@@ -158,7 +172,9 @@ const char* GetCdmVersion() {
 
 namespace media {
 
-ClearKeyCdm::ClearKeyCdm(ClearKeyCdmHost* host, bool is_decrypt_only)
+ClearKeyCdm::ClearKeyCdm(ClearKeyCdmHost* host,
+                         bool is_decrypt_only,
+                         bool should_test_file_io)
     : decryptor_(
           base::Bind(&ClearKeyCdm::OnSessionCreated, base::Unretained(this)),
           base::Bind(&ClearKeyCdm::OnSessionMessage, base::Unretained(this)),
@@ -167,7 +183,8 @@ ClearKeyCdm::ClearKeyCdm(ClearKeyCdmHost* host, bool is_decrypt_only)
           base::Bind(&ClearKeyCdm::OnSessionError, base::Unretained(this))),
       host_(host),
       is_decrypt_only_(is_decrypt_only),
-      heartbeat_session_id_(0),
+      should_test_file_io_(should_test_file_io),
+      last_session_id_(MediaKeys::kInvalidSessionId),
       timer_delay_ms_(kInitialTimerDelayMs),
       timer_set_(false) {
 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
@@ -190,8 +207,11 @@ void ClearKeyCdm::CreateSession(uint32 session_id,
   decryptor_.CreateSession(
       session_id, std::string(type, type_size), init_data, init_data_size);
 
-  // Only save the latest session ID for heartbeat messages.
-  heartbeat_session_id_ = session_id;
+  // Save the latest session ID for heartbeat and file IO test messages.
+  last_session_id_ = session_id;
+
+  if (should_test_file_io_)
+    StartFileIOTest();
 }
 
 void ClearKeyCdm::UpdateSession(uint32 session_id,
@@ -224,7 +244,7 @@ void ClearKeyCdm::TimerExpired(void* context) {
   // There is no service at this URL, so applications should ignore it.
   const char url[] = "http://test.externalclearkey.chromium.org";
 
-  host_->OnSessionMessage(heartbeat_session_id_,
+  host_->OnSessionMessage(last_session_id_,
                           heartbeat_message.data(),
                           heartbeat_message.size(),
                           url,
@@ -556,4 +576,19 @@ cdm::Status ClearKeyCdm::GenerateFakeAudioFrames(
 }
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
+void ClearKeyCdm::StartFileIOTest() {
+  file_io_test_runner_.reset(new FileIOTestRunner(
+      base::Bind(&ClearKeyCdmHost::CreateFileIO, base::Unretained(host_))));
+  file_io_test_runner_->RunAllTests(
+      base::Bind(&ClearKeyCdm::OnFileIOTestComplete, base::Unretained(this)));
+}
+
+void ClearKeyCdm::OnFileIOTestComplete(bool success) {
+  DVLOG(1) << __FUNCTION__ << ": " << success;
+  std::string message = GetFileIOTestResultMessage(success);
+  host_->OnSessionMessage(
+      last_session_id_, message.data(), message.size(), NULL, 0);
+  file_io_test_runner_.reset();
+}
+
 }  // namespace media
diff --git a/media/cdm/ppapi/clear_key_cdm.h b/media/cdm/ppapi/clear_key_cdm.h
index 87f45e1..79c8af0 100644
--- a/media/cdm/ppapi/clear_key_cdm.h
+++ b/media/cdm/ppapi/clear_key_cdm.h
@@ -23,6 +23,7 @@
 #endif
 
 namespace media {
+class FileIOTestRunner;
 class CdmVideoDecoder;
 class DecoderBuffer;
 class FFmpegCdmAudioDecoder;
@@ -30,7 +31,9 @@ class FFmpegCdmAudioDecoder;
 // Clear key implementation of the cdm::ContentDecryptionModule interface.
 class ClearKeyCdm : public ClearKeyCdmInterface {
  public:
-  explicit ClearKeyCdm(Host* host, bool is_decrypt_only);
+  explicit ClearKeyCdm(Host* host,
+                       bool is_decrypt_only,
+                       bool should_test_file_io);
   virtual ~ClearKeyCdm();
 
   // ContentDecryptionModule implementation.
@@ -104,13 +107,19 @@ class ClearKeyCdm : public ClearKeyCdmInterface {
                                       cdm::AudioFrames* audio_frames);
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
+  void StartFileIOTest();
+
+  // Callback for CDM File IO test.
+  void OnFileIOTestComplete(bool success);
+
   AesDecryptor decryptor_;
 
   ClearKeyCdmHost* host_;
 
   const bool is_decrypt_only_;
+  const bool should_test_file_io_;
 
-  uint32 heartbeat_session_id_;
+  uint32 last_session_id_;
   std::string next_heartbeat_message_;
 
   // Timer delay in milliseconds for the next host_->SetTimer() call.
@@ -134,6 +143,8 @@ class ClearKeyCdm : public ClearKeyCdmInterface {
 
   scoped_ptr<CdmVideoDecoder> video_decoder_;
 
+  scoped_ptr<FileIOTestRunner> file_io_test_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(ClearKeyCdm);
 };
 
diff --git a/media/media_cdm.gypi b/media/media_cdm.gypi
index 553d360..e064d8b 100644
--- a/media/media_cdm.gypi
+++ b/media/media_cdm.gypi
@@ -81,6 +81,8 @@
             '<(DEPTH)/base/base.gyp:base',
           ],
           'sources': [
+            'cdm/ppapi/cdm_file_io_test.cc',
+            'cdm/ppapi/cdm_file_io_test.h',
             'cdm/ppapi/cdm_video_decoder.cc',
             'cdm/ppapi/cdm_video_decoder.h',
             'cdm/ppapi/clear_key_cdm.cc',