Add MSA (MIPS SIMD Arch) optimized color conversion functions

third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp b/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
index c485cce7b9240db6d676e2a7b07cf811bb5890ca..9ac3a973e7345250b71e35f454138449489f6dab 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
@@ -710,6 +710,9 @@ void pack<WebGLImageConversion::DataFormatR8,
 #if CPU(X86) || CPU(X86_64)
   SIMD::packOneRowOfRGBA8LittleToR8(source, destination, pixelsPerRow);
 #endif
+#if HAVE(MIPS_MSA_INTRINSICS)
+  SIMD::packOneRowOfRGBA8LittleToR8MSA(source, destination, pixelsPerRow);
+#endif
   for (unsigned i = 0; i < pixelsPerRow; ++i) {
     float scaleFactor = source[3] ? 255.0f / source[3] : 1.0f;
     uint8_t sourceR =
@@ -764,6 +767,9 @@ void pack<WebGLImageConversion::DataFormatRA8,
 #if CPU(X86) || CPU(X86_64)
   SIMD::packOneRowOfRGBA8LittleToRA8(source, destination, pixelsPerRow);
 #endif
+#if HAVE(MIPS_MSA_INTRINSICS)
+  SIMD::packOneRowOfRGBA8LittleToRA8MSA(source, destination, pixelsPerRow);
+#endif
   for (unsigned i = 0; i < pixelsPerRow; ++i) {
     float scaleFactor = source[3] ? 255.0f / source[3] : 1.0f;
     uint8_t sourceR =
@@ -903,6 +909,10 @@ void pack<WebGLImageConversion::DataFormatRGBA4444,
 #if HAVE(ARM_NEON_INTRINSICS)
   SIMD::packOneRowOfRGBA8ToUnsignedShort4444(source, destination, pixelsPerRow);
 #endif
+#if HAVE(MIPS_MSA_INTRINSICS)
+  SIMD::packOneRowOfRGBA8ToUnsignedShort4444MSA(source, destination,
+                                                pixelsPerRow);
+#endif
   for (unsigned i = 0; i < pixelsPerRow; ++i) {
     *destination = (((source[0] & 0xF0) << 8) | ((source[1] & 0xF0) << 4) |
                     (source[2] & 0xF0) | (source[3] >> 4));