Introduce a client minimum picture pool size

content/common/gpu/media/android_video_decode_accelerator.cc

Index: content/common/gpu/media/android_video_decode_accelerator.cc
diff --git a/content/common/gpu/media/android_video_decode_accelerator.cc b/content/common/gpu/media/android_video_decode_accelerator.cc
index 06d59863d049cacd6c03b22a0ebbf0e908d9755e..f420439d31b7d261aa89d00c578524a88ae992fc 100644
--- a/content/common/gpu/media/android_video_decode_accelerator.cc
+++ b/content/common/gpu/media/android_video_decode_accelerator.cc
@@ -70,6 +70,7 @@ AndroidVideoDecodeAccelerator::AndroidVideoDecodeAccelerator(
     const base::WeakPtr<gpu::gles2::GLES2Decoder> decoder,
     const base::Callback<bool(void)>& make_context_current)
     : client_(NULL),
+      num_picture_buffers_(kNumPictureBuffers),
       make_context_current_(make_context_current),
       codec_(media::kCodecH264),
       state_(NO_ERROR),
@@ -83,11 +84,14 @@ AndroidVideoDecodeAccelerator::~AndroidVideoDecodeAccelerator() {
 }
 
 bool AndroidVideoDecodeAccelerator::Initialize(media::VideoCodecProfile profile,
+                                               uint32 min_picture_count,
                                                Client* client) {
   DCHECK(!media_codec_);
   DCHECK(thread_checker_.CalledOnValidThread());
 
   client_ = client;
+  num_picture_buffers_ = std::max(min_picture_count,
+                                  static_cast<uint32>(kNumPictureBuffers));
 
   if (profile == media::VP8PROFILE_ANY) {
     codec_ = media::kCodecVP8;
@@ -415,7 +419,7 @@ void AndroidVideoDecodeAccelerator::AssignPictureBuffers(
     dismissed_picture_ids_.erase(id);
   }
 
-  RETURN_ON_FAILURE(output_picture_buffers_.size() == kNumPictureBuffers,
+  RETURN_ON_FAILURE(output_picture_buffers_.size() == num_picture_buffers_,
                     "Invalid picture buffers were passed.",
                     INVALID_ARGUMENT);
 
@@ -528,7 +532,7 @@ bool AndroidVideoDecodeAccelerator::CanDecodeOnIOThread() {
 }
 
 void AndroidVideoDecodeAccelerator::RequestPictureBuffers() {
-  client_->ProvidePictureBuffers(kNumPictureBuffers, size_, GL_TEXTURE_2D);
+  client_->ProvidePictureBuffers(num_picture_buffers_, size_, GL_TEXTURE_2D);
 }
 
 void AndroidVideoDecodeAccelerator::NotifyPictureReady(