Reland of Extend CopyTextureCHROMIUM to more ES 3.0 texture formats.

gpu/command_buffer/common/gles2_cmd_utils.cc

Index: gpu/command_buffer/common/gles2_cmd_utils.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils.cc b/gpu/command_buffer/common/gles2_cmd_utils.cc
index 817efc124367008ba1f9efdd241d5a69f192076d..de4a2e3dbd3b5027bc13cec51de70873f7bf2114 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils.cc
@@ -475,8 +475,39 @@ int GLES2Util::GLGetNumValuesReturned(int id) const {
 
 namespace {
 
+// Return the number of bytes per element, based on the element type.
+int BytesPerElement(int type) {
+  switch (type) {
+    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+      return 8;
+    case GL_FLOAT:
+    case GL_UNSIGNED_INT_24_8_OES:
+    case GL_UNSIGNED_INT:
+    case GL_INT:
+    case GL_UNSIGNED_INT_2_10_10_10_REV:
+    case GL_UNSIGNED_INT_10F_11F_11F_REV:
+    case GL_UNSIGNED_INT_5_9_9_9_REV:
+      return 4;
+    case GL_HALF_FLOAT:
+    case GL_HALF_FLOAT_OES:
+    case GL_UNSIGNED_SHORT:
+    case GL_SHORT:
+    case GL_UNSIGNED_SHORT_5_6_5:
+    case GL_UNSIGNED_SHORT_4_4_4_4:
+    case GL_UNSIGNED_SHORT_5_5_5_1:
+      return 2;
+    case GL_UNSIGNED_BYTE:
+    case GL_BYTE:
+      return 1;
+    default:
+      return 0;
+  }
+}
+
+}  // anonymous namespace
+
 // Return the number of elements per group of a specified format.
-int ElementsPerGroup(int format, int type) {
+int GLES2Util::ElementsPerGroup(int format, int type) {
   switch (type) {
     case GL_UNSIGNED_SHORT_5_6_5:
     case GL_UNSIGNED_SHORT_4_4_4_4:
@@ -521,37 +552,6 @@ int ElementsPerGroup(int format, int type) {
   }
 }
 
-// Return the number of bytes per element, based on the element type.
-int BytesPerElement(int type) {
-  switch (type) {
-    case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
-      return 8;
-    case GL_FLOAT:
-    case GL_UNSIGNED_INT_24_8_OES:
-    case GL_UNSIGNED_INT:
-    case GL_INT:
-    case GL_UNSIGNED_INT_2_10_10_10_REV:
-    case GL_UNSIGNED_INT_10F_11F_11F_REV:
-    case GL_UNSIGNED_INT_5_9_9_9_REV:
-      return 4;
-    case GL_HALF_FLOAT:
-    case GL_HALF_FLOAT_OES:
-    case GL_UNSIGNED_SHORT:
-    case GL_SHORT:
-    case GL_UNSIGNED_SHORT_5_6_5:
-    case GL_UNSIGNED_SHORT_4_4_4_4:
-    case GL_UNSIGNED_SHORT_5_5_5_1:
-       return 2;
-    case GL_UNSIGNED_BYTE:
-    case GL_BYTE:
-       return 1;
-    default:
-       return 0;
-  }
-}
-
-}  // anonymous namespace
-
 uint32_t GLES2Util::ComputeImageGroupSize(int format, int type) {
   int bytes_per_element = BytesPerElement(type);
   DCHECK_GE(8, bytes_per_element);