Add YUV_420_BIPLANAR to gfx::BufferFormat.

content/common/gpu/client/gpu_memory_buffer_impl.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl.cc b/content/common/gpu/client/gpu_memory_buffer_impl.cc
index cc0ac0044ac2997e2a9d6782d171e202a8ea4ad0..a294323f666a6707a7db9ec268aaa7fc18bcbd0a 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl.cc
@@ -97,6 +97,11 @@ size_t GpuMemoryBufferImpl::SubsamplingFactor(gfx::BufferFormat format,
       DCHECK_LT(static_cast<size_t>(plane), arraysize(factor));
       return factor[plane];
     }
+    case gfx::BufferFormat::YUV_420_BIPLANAR: {
+      static size_t factor[] = {1, 2};
+      DCHECK_LT(static_cast<size_t>(plane), arraysize(factor));
+      return factor[plane];
+    }
   }
   NOTREACHED();
   return 0;
@@ -144,6 +149,10 @@ bool GpuMemoryBufferImpl::RowSizeInBytes(size_t width,
       DCHECK_EQ(width % 2, 0u);
       *size_in_bytes = width / SubsamplingFactor(format, plane);
       return true;
+    case gfx::BufferFormat::YUV_420_BIPLANAR:
+      DCHECK_EQ(width % 2, 0u);
+      *size_in_bytes = width;
+      return true;
   }
   NOTREACHED();
   return false;