Merge "Coalesce input events that arrive faster than 333Hz."

namespace android {

#define ROUND_UP(value, boundary) (((value) + (boundary) - 1) & ~((boundary) - 1))

#define MIN_HISTORY_DEPTH 20

// Must be at least sizeof(InputMessage) + sufficient space for pointer data

static const int DEFAULT_MESSAGE_BUFFER_SIZE = 16384;

static const int DEFAULT_MESSAGE_BUFFER_SIZE = ROUND_UP(

        sizeof(InputMessage) + MIN_HISTORY_DEPTH

                * (sizeof(InputMessage::SampleData) + MAX_POINTERS * sizeof(PointerCoords)),

        4096);

// Signal sent by the producer to the consumer to inform it that a new message is

// available to be consumed in the shared memory buffer.