Rename "color" functions to "pixel" functions.

This extends of the copy, read and write functions to cover depth and
stencil formats.

Refactoring change only.

Bug: angleproject:2673
Change-Id: I4b0b2f4cf8621051cacd95cdbd6d70f94ca612e2
Reviewed-on: https://chromium-review.googlesource.com/1147152
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/renderer_utils.h b/src/libANGLE/renderer/renderer_utils.h
index 34140bf..9f0573c 100644
--- a/src/libANGLE/renderer/renderer_utils.h
+++ b/src/libANGLE/renderer/renderer_utils.h
@@ -122,9 +122,9 @@
                                        size_t destRowPitch,
                                        size_t destDepthPitch);
 
-typedef void (*ColorReadFunction)(const uint8_t *source, uint8_t *dest);
-typedef void (*ColorWriteFunction)(const uint8_t *source, uint8_t *dest);
-typedef void (*ColorCopyFunction)(const uint8_t *source, uint8_t *dest);
+typedef void (*PixelReadFunction)(const uint8_t *source, uint8_t *dest);
+typedef void (*PixelWriteFunction)(const uint8_t *source, uint8_t *dest);
+typedef void (*PixelCopyFunction)(const uint8_t *source, uint8_t *dest);
 
 class FastCopyFunctionMap
 {
@@ -132,7 +132,7 @@
     struct Entry
     {
         angle::FormatID formatID;
-        ColorCopyFunction func;
+        PixelCopyFunction func;
     };
 
     constexpr FastCopyFunctionMap() : FastCopyFunctionMap(nullptr, 0) {}
@@ -140,7 +140,7 @@
     constexpr FastCopyFunctionMap(const Entry *data, size_t size) : mSize(size), mData(data) {}
 
     bool has(angle::FormatID formatID) const;
-    ColorCopyFunction get(angle::FormatID formatID) const;
+    PixelCopyFunction get(angle::FormatID formatID) const;
 
   private:
     size_t mSize;
@@ -208,11 +208,11 @@
 void CopyImageCHROMIUM(const uint8_t *sourceData,
                        size_t sourceRowPitch,
                        size_t sourcePixelBytes,
-                       ColorReadFunction readFunction,
+                       PixelReadFunction pixelReadFunction,
                        uint8_t *destData,
                        size_t destRowPitch,
                        size_t destPixelBytes,
-                       ColorWriteFunction colorWriteFunction,
+                       PixelWriteFunction pixelWriteFunction,
                        GLenum destUnsizedFormat,
                        GLenum destComponentType,
                        size_t width,