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It seems that when bit accounting was introduced in
https://chromium-review.googlesource.com/#/c/400658/
there was one place which was accidentally skipped, leading to build failures
with --enable-dering. This patch adds the missing information.

Change-Id: I59e1bd6f7e1d4fa58506ee7af307b845c78a7cbe

Account for the rectangular transform block size in setting the
context data.

Change-Id: Ic30a6a3eaaca4c945e0aab3acbaeb99aa48b0064

Change-Id: Ic9f34e32e51f8a8a4426543bae0b92f5fab0792e

"varios" -> "various"

Change-Id: If91a462dc009f701c48c2cfd7965cd71f61f2970

By default, when building with --enable-accounting the bit accounting
 code will collect statistics for every frame while decoding.
Collecting statistics can slow down decode time and we would eventually
 like to enable the CONFIG_ACCOUNTING flag by default.
This patch adds a runtime flag so that bit accounting statistics are
 only collected when actually needed.

Change-Id: I25d9eaf26ea132d61ace95b952872158c9ac29e7

This decoder control requires AV1 to be compiled with --enable-accounting.
Note that bit accounting data is only available after a frame has been
 decoded.

Change-Id: I8a15213d9f2587638e0edb62932738e985160e03

ISO C90 forbids mixed declarations and code and the function
 aom_accounting_set_context() was being called before the MB_MODE_INFO
 declaration.

Change-Id: I8619525b1b2fd37753891bd310d9d59c881b8807

Move computing the class0_fp_cdf and fp_cdf tables per coded mv
 symbol to computing it only when the probabilities are updated.

Change-Id: Ib4957c8ab21e6189bcc3817a07b7681dfb343223

Move computing the class_cdf table per coded mv class symbol to
 computing it only when the probabilities are updated.

Change-Id: I6c4a9075817e8ba2e251f0e82436995f08f2ec5c

Move computing the joint_cdf table per coded mv joint symbol to
 computing it only when the probabilities are updated.

Change-Id: If5d195f70e6fad7b60f69606c8386ad5e69657d2

Move computing the inter_mode_cdf tables per coded inter mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I7a7b059ee75723cb6f278ed82a20cf34c27915d8

Limit the recursive transform block partition depth to 2. For a
32x32 transform block unit, one can maximally go down to 8x8 transform
block size.

Change-Id: I2caa92bb2eee64762b7ecca8920259f7c50fb0aa

Check the encoding statistics. If all the coding blocks use the
max transform size, skip transform size coding in the frame header.

Change-Id: I31cb16314e87f945d7e95a34a90a5536b3ed82d5

Skip counting the inter transform block size distribution for
the intra transform block size coding.

Change-Id: Ifad9d843f57d069d0619a54d66ca18101e1b69f1

Change-Id: I1e4a43f5f08b76867240a207c60d7e85a8ffbb74

Use lookup table to replace the arithmetic computation for transform
block step.

Change-Id: I1318d81bda9d7ffaf9d550acd19354b0615ede36

This prepares the support to both rectangular and 2x2 transform
block sizes.

Change-Id: I3c2d4e317f6b627bb45d2273c278331bd976ee92

Allow the decoder to memset partial dequantized coefficient line
to zero.

Change-Id: I1f07dc7bf802958754502c1b5c819cc81e7a08cb

Change-Id: Ida036defe5688894a63007a31aa2dd0b3f0b5d59

Move computing the uv_mode_cdf tables per coded intra mode symbol to
 computing them only when the probabilities are updated.

Change-Id: I627b59d30726c913f5d7ba7753cb0446a12655bb