Fix incorrect Rec601 YUV conversion matrix coefficient.

src/gpu/effects/GrYUVtoRGBEffect.cpp

Index: src/gpu/effects/GrYUVtoRGBEffect.cpp
diff --git a/src/gpu/effects/GrYUVtoRGBEffect.cpp b/src/gpu/effects/GrYUVtoRGBEffect.cpp
index 0023b1b30079293646c33cb49739154ffa457d05..4ffc345a2cdc755acc8834d7c24103af8e7c5963 100644
--- a/src/gpu/effects/GrYUVtoRGBEffect.cpp
+++ b/src/gpu/effects/GrYUVtoRGBEffect.cpp
@@ -132,8 +132,8 @@ const GrGLfloat YUVtoRGBEffect::GLEffect::kJPEGConversionMatrix[16] = {
     1.0f,  1.772f,    0.0f,    -0.886f,
     0.0f,  0.0f,      0.0f,     1.0};
 const GrGLfloat YUVtoRGBEffect::GLEffect::kRec601ConversionMatrix[16] = {
-    1.164f,  0.0f,    1.596f, -1.08175f,
-    1.164f, -0.391f, -0.813f,  0.529f,
+    1.164f,  0.0f,    1.596f, -0.87075f,
+    1.164f, -0.391f, -0.813f,  0.52925f,
     1.164f,  2.018f,  0.0f,   -1.08175f,
     0.0f,    0.0f,    0.0f,    1.0};
 }