Implement support for rendering to 32-bit float textures on ES3

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float_rgb.txt

Index: gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float_rgb.txt
diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float_rgb.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float_rgb.txt
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index 0000000000000000000000000000000000000000..7f220088cc00a8091c49c3cc716c2229d4dd534f
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+++ b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float_rgb.txt
@@ -0,0 +1,64 @@
+Name
+
+    CHROMIUM_color_buffer_float_rgb
+
+Name Strings
+
+    GL_CHROMIUM_color_buffer_float_rgb
+
+Version
+
+    Last Modifed Date: February 7, 2014
+
+Dependencies
+
+    This extension is written against the OpenGL ES 2.0 specification.
+
+    OpenGL ES 2.0 is required.
+
+    OES_texture_float is required.
+
+Overview
+
+    This extension implements a subset of ARB_color_buffer_float on top of
+    OpenGL ES 2.0.
+
+    This extension enables rendering to floating point RGB textures. When
+    this extension is enabled:
+
+    * The 32-bit floating point type GL_RGB32F becomes available as a
+      color-renderable internal format. Textures created with type = FLOAT,
+      and internal format GL_RGB32F, can be attached to framebuffer object
+      color attachments for rendering.
+
+    * GL_RGB / GL_RGB32F becomes an allowable format / internalformat parameter
+      pair for TexImage2D. The restriction in section 3.7.1 of the OpenGL ES
+      2.0 spec that the internalformat parameter and format parameter of
+      TexImage2D must match is lifted for this case.
+
+    Floating point RGB textures may still be created also with the unsized
+    GL_RGB internal format, but whether such textures are renderable is not
+    guaranteed.
+
+New Tokens
+
+    Accepted by the <internalformat> parameter of TexImage2D:
+
+    GL_RGB32F       0x8815
+
+New Procedures and Functions
+
+    None.
+
+Errors
+
+    None.
+
+New State
+
+    None.
+
+Revision History
+
+    2/7/2014    Documented the extension
+