Add 'cbcs' encryption scheme support in Android media.

media/base/encryption_scheme.cc

 // Copyright 2015 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/base/encryption_scheme.h"
 
 namespace media {
 
 EncryptionScheme::Pattern::Pattern() {}
 
 EncryptionScheme::Pattern::Pattern(uint32_t encrypt_blocks,
                                    uint32_t skip_blocks)
     : encrypt_blocks_(encrypt_blocks), skip_blocks_(skip_blocks) {}
 
 EncryptionScheme::Pattern::~Pattern() {}
 
+uint32_t EncryptionScheme::Pattern::encrypt_blocks() const {
+  return encrypt_blocks_;
+}
+
+uint32_t EncryptionScheme::Pattern::skip_blocks() const {
+  return skip_blocks_;
+}
+
 bool EncryptionScheme::Pattern::Matches(const Pattern& other) const {
   return encrypt_blocks_ == other.encrypt_blocks() &&
          skip_blocks_ == other.skip_blocks();
 }
 
 bool EncryptionScheme::Pattern::IsInEffect() const {
   return encrypt_blocks_ != 0 && skip_blocks_ != 0;
 }
 
 EncryptionScheme::EncryptionScheme() {}
 
 EncryptionScheme::EncryptionScheme(CipherMode mode, const Pattern& pattern)
     : mode_(mode), pattern_(pattern) {}
 
 EncryptionScheme::~EncryptionScheme() {}
 
+bool EncryptionScheme::is_encrypted() const {
+  return mode_ != CIPHER_MODE_UNENCRYPTED;
+}
+
+EncryptionScheme::CipherMode EncryptionScheme::mode() const {
+  return mode_;
+}
+
+const EncryptionScheme::Pattern& EncryptionScheme::pattern() const {
+  return pattern_;
+}
+
 bool EncryptionScheme::Matches(const EncryptionScheme& other) const {
   return mode_ == other.mode_ && pattern_.Matches(other.pattern_);
 }
 
 }  // namespace media