Implement the texture uploading of ASTC compression for WebGL(part II)

Source/modules/webgl/WebGLCompressedTextureASTC.idl

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+    NoInterfaceObject,
+    DoNotCheckConstants,
+    WillBeGarbageCollected,

[Ken Russell (switch to Gerrit), 2015/08/18 00:05:03]

The Oilpan switch has been thrown for the WebGL module so this now needs to be
"GarbageCollected".

+    SetWrapperReferenceFrom=canvas,
+] interface WebGLCompressedTextureASTC {

[Ken Russell (switch to Gerrit), 2015/08/18 00:05:03]

Note that the API for this extension was changed a bit to add a
getSupportedProfiles() method, but if you'd rather not implement that method (it
would basically require you finding all of the underlying OpenGL extensions
starting with GL_KHR_texture_compression_astc and adding their suffixes), we can
implement it after you've landed this initial patch.

+    /* Compressed Texture Formats */
+    const unsigned long COMPRESSED_RGBA_ASTC_4x4_KHR           = 0x93B0;
+    const unsigned long COMPRESSED_RGBA_ASTC_5x4_KHR           = 0x93B1;
+    const unsigned long COMPRESSED_RGBA_ASTC_5x5_KHR           = 0x93B2;
+    const unsigned long COMPRESSED_RGBA_ASTC_6x5_KHR           = 0x93B3;
+    const unsigned long COMPRESSED_RGBA_ASTC_6x6_KHR           = 0x93B4;
+    const unsigned long COMPRESSED_RGBA_ASTC_8x5_KHR           = 0x93B5;
+    const unsigned long COMPRESSED_RGBA_ASTC_8x6_KHR           = 0x93B6;
+    const unsigned long COMPRESSED_RGBA_ASTC_8x8_KHR           = 0x93B7;
+    const unsigned long COMPRESSED_RGBA_ASTC_10x5_KHR          = 0x93B8;
+    const unsigned long COMPRESSED_RGBA_ASTC_10x6_KHR          = 0x93B9;
+    const unsigned long COMPRESSED_RGBA_ASTC_10x8_KHR          = 0x93BA;
+    const unsigned long COMPRESSED_RGBA_ASTC_10x10_KHR         = 0x93BB;
+    const unsigned long COMPRESSED_RGBA_ASTC_12x10_KHR         = 0x93BC;
+    const unsigned long COMPRESSED_RGBA_ASTC_12x12_KHR         = 0x93BD;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR   = 0x93D0;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR   = 0x93D1;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR   = 0x93D2;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR   = 0x93D3;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR   = 0x93D4;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR   = 0x93D5;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR   = 0x93D6;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR   = 0x93D7;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR  = 0x93D8;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR  = 0x93D9;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR  = 0x93DA;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR = 0x93DB;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR = 0x93DC;
+    const unsigned long COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR = 0x93DD;
+};