Add support for NEON intrinsics to speed up texture compression. We can

src/opts/SkTextureCompression_opts_arm.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkTextureCompression_opts.h"
+#include "SkTextureCompression_opts_neon.h"
+#include "SkUtilsArm.h"
+
+SkTextureCompressor::CompressionProc
+SkTextureCompressorGetPlatformProc(SkColorType colorType, SkTextureCompressor::Format fmt) {
+#if SK_ARM_NEON_IS_NONE
+    return NULL;
+#else
+#if SK_ARM_NEON_IS_DYNAMIC
+    if (!sk_cpu_arm_has_neon()) {
+        return NULL;
+    }
+#endif
+    switch (colorType) {
+        case kAlpha_8_SkColorType:
+        {
+            switch (fmt) {
+                case SkTextureCompressor::kR11_EAC_Format:
+                    return CompressA8toR11EAC_NEON;
+                default:
+                    return NULL;
+            }
+        }
+        break;
+
+        default:
+            return NULL;
+    }
+#endif
+}