Add limitations of number of frames that can be created in I420BufferPool::CreateBuffer.

webrtc/common_video/i420_buffer_pool.cc

Index: webrtc/common_video/i420_buffer_pool.cc
diff --git a/webrtc/common_video/i420_buffer_pool.cc b/webrtc/common_video/i420_buffer_pool.cc
index 76a53c568827c6f323d3e460bf97f35c18c28e27..9d2d2f95149a1ce7f1de2b40fb6be68c8f6d41c3 100644
--- a/webrtc/common_video/i420_buffer_pool.cc
+++ b/webrtc/common_video/i420_buffer_pool.cc
@@ -24,6 +24,7 @@ void I420BufferPool::Release() {
 rtc::scoped_refptr<I420Buffer> I420BufferPool::CreateBuffer(int width,
                                                             int height) {
   RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
+  RTC_CHECK(buffers_.size() < kMaxNumberOfFramesBeforeCrash);

[magjed_webrtc, 2016/09/26 14:50:55]

nit: Use RTC_CHECK_LT (even if it must crash exactly at
kMaxNumberOfFramesBeforeCrash with the current code).

[perkj_webrtc, 2016/09/27 07:41:41]

Done.

   // Release buffers with wrong resolution.
   for (auto it = buffers_.begin(); it != buffers_.end();) {
     if ((*it)->width() != width || (*it)->height() != height)