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

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float.txt

Index: gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float.txt
diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8e5ddd834f0de6608783a42f241c86ba4008110c
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+++ b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_color_buffer_float.txt
@@ -0,0 +1,65 @@
+Name
+
+    CHROMIUM_color_buffer_float
+
+Name Strings
+
+    GL_CHROMIUM_color_buffer_float
+
+Version
+
+    Last Modifed Date: February 6, 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 EXT_color_buffer_float on top of
+    OpenGL ES 2.0.
+
+    This extension enables rendering to floating point RGB(A) textures. When
+    this extension is enabled:
+
+    * The 32-bit floating point types GL_RGB32F and GL_RGBA32F become available
+      as color-renderable internal formats. Textures created with type = FLOAT,
+      which will have one of these internal formats, can be attached to
+      framebuffer object color attachments for rendering.
+
+    * GL_RGBA / GL_RGBA32F and GL_RGB / GL_RGB32F become allowable format /
+      internalformat parameter pairs 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 these cases.
+
+    Floating point RGB(A) textures may still be created also with unsized
+    GL_RGB and GL_RGBA internal formats, but such textures will not be
+    renderable.
+
+New Tokens
+
+    Accepted by the <internalformat> parameter of TexImage2D:
+
+    GL_RGBA32F      0x8814
+    GL_RGB32F       0x8815
+
+New Procedures and Functions
+
+    None.
+
+Errors
+
+    None.
+
+New State
+
+    None.
+
+Revision History
+
+    2/6/2014    Documented the extension
+