CpuConsumer: Add set buffer size and format functions.

    // log messages.

    void setName(const String8& name);

    // setDefaultBufferSize is used to set the size of buffers returned by

    // requestBuffers when a width and height of zero is requested.

    // A call to setDefaultBufferSize() may trigger requestBuffers() to

    // be called from the client. Default size is 1x1.

    status_t setDefaultBufferSize(uint32_t width, uint32_t height);

    // setDefaultBufferFormat allows CpuConsumer's BufferQueue to create buffers

    // of a defaultFormat if no format is specified by producer. Formats are

    // enumerated in graphics.h; the initial default is

    // HAL_PIXEL_FORMAT_RGBA_8888.

    status_t setDefaultBufferFormat(uint32_t defaultFormat);

    // Gets the next graphics buffer from the producer and locks it for CPU use,

    // filling out the passed-in locked buffer structure with the native pointer

    // and metadata. Returns BAD_VALUE if no new buffer is available, and

    mBufferQueue->setConsumerName(name);

}

status_t CpuConsumer::setDefaultBufferSize(uint32_t width, uint32_t height)

{

    Mutex::Autolock _l(mMutex);

    return mBufferQueue->setDefaultBufferSize(width, height);

}

status_t CpuConsumer::setDefaultBufferFormat(uint32_t defaultFormat)

{

    Mutex::Autolock _l(mMutex);

    return mBufferQueue->setDefaultBufferFormat(defaultFormat);

}

status_t CpuConsumer::lockNextBuffer(LockedBuffer *nativeBuffer) {

    status_t err;