Add CDM allocator interface.

webkit/media/crypto/ppapi/clear_key_cdm.h

Index: webkit/media/crypto/ppapi/clear_key_cdm.h
diff --git a/webkit/media/crypto/ppapi/clear_key_cdm.h b/webkit/media/crypto/ppapi/clear_key_cdm.h
index eaad45d9b2e095ba2e765f95e410523ade03de8f..e0b1b1570a0b698019d2f4f49e01b10d838ff562 100644
--- a/webkit/media/crypto/ppapi/clear_key_cdm.h
+++ b/webkit/media/crypto/ppapi/clear_key_cdm.h
@@ -21,6 +21,8 @@ class DecoderBuffer;
 
 namespace webkit_media {
 
+class CdmAllocatorInterface;
+
 // Clear key implementation of the cdm::ContentDecryptionModule interface.
 class ClearKeyCdm : public cdm::ContentDecryptionModule {
  public:
@@ -28,6 +30,8 @@ class ClearKeyCdm : public cdm::ContentDecryptionModule {
   virtual ~ClearKeyCdm();
 
   // ContentDecryptionModule implementation.
+  virtual bool Initialize(CdmAllocatorInterface* allocator) OVERRIDE;
+
   virtual cdm::Status GenerateKeyRequest(const uint8_t* init_data,
                                          int init_data_size,
                                          cdm::KeyMessage* key_request) OVERRIDE;
@@ -97,6 +101,8 @@ class ClearKeyCdm : public cdm::ContentDecryptionModule {
   // Protects the |client_| from being accessed by the |decryptor_|
   // simultaneously.
   base::Lock client_lock_;
+  // Allocates shared memory buffers using the CDM wrapper.

[xhwang, 2012/09/01 13:49:09]

Again, the CDM doesn't care what the allocator implementation is used.

[Tom Finegan, 2012/09/01 21:32:49]

My reasoning for this comment is that allocation of shared memory carries
implied alignment per
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/VzuISrCbq...

[ddorwin, 2012/09/04 09:53:15]

If alignment is the information you want to provide, just say so explicitly in
the CdmAllocator (then DCHECK it everywhere). I would not have known that this
implied alignment.

+  CdmAllocatorInterface* allocator_iface_;
 };
 
 }  // namespace webkit_media