Add gfx::GpuMemoryBuffer::YUV_420 and GpuMemoryBufferImplSharedMemory support

ui/gl/gl_image_linux_dma_buffer.cc

Index: ui/gl/gl_image_linux_dma_buffer.cc
diff --git a/ui/gl/gl_image_linux_dma_buffer.cc b/ui/gl/gl_image_linux_dma_buffer.cc
index 04ad06bd438433b270c60b804509a088d08e0a44..080c9b5a2da306913b2fa734beef317b9061fb1f 100644
--- a/ui/gl/gl_image_linux_dma_buffer.cc
+++ b/ui/gl/gl_image_linux_dma_buffer.cc
@@ -39,6 +39,7 @@ bool ValidFormat(unsigned internalformat, gfx::GpuMemoryBuffer::Format format) {
         case gfx::GpuMemoryBuffer::ETC1:
         case gfx::GpuMemoryBuffer::RGBA_8888:
         case gfx::GpuMemoryBuffer::BGRA_8888:
+        case gfx::GpuMemoryBuffer::YUV_420:
           return false;
       }
       NOTREACHED();
@@ -54,6 +55,7 @@ bool ValidFormat(unsigned internalformat, gfx::GpuMemoryBuffer::Format format) {
         case gfx::GpuMemoryBuffer::ETC1:
         case gfx::GpuMemoryBuffer::RGBX_8888:
         case gfx::GpuMemoryBuffer::RGBA_8888:
+        case gfx::GpuMemoryBuffer::YUV_420:
           return false;
       }
       NOTREACHED();
@@ -75,6 +77,7 @@ EGLint FourCC(gfx::GpuMemoryBuffer::Format format) {
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
     case gfx::GpuMemoryBuffer::RGBA_8888:
+    case gfx::GpuMemoryBuffer::YUV_420:
       NOTREACHED();
       return 0;
   }