Add 'cbcs' encryption scheme support in Android media.

media/base/encryption_scheme.cc

Index: media/base/encryption_scheme.cc
diff --git a/media/base/encryption_scheme.cc b/media/base/encryption_scheme.cc
index 70d133c65ab4612fc69d020aa7c3a5de5023acc5..dea08ed5d51ca8f7291299544f11135d8ff5b2be 100644
--- a/media/base/encryption_scheme.cc
+++ b/media/base/encryption_scheme.cc
@@ -14,6 +14,14 @@ EncryptionScheme::Pattern::Pattern(uint32_t encrypt_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();
@@ -30,6 +38,18 @@ EncryptionScheme::EncryptionScheme(CipherMode mode, const 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_);
 }