Remove flip_y, premultiply_alpha, unmultiply_alpha support in command buffer.

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_flipy.txt

-Name
-
-    CHROMIUM_flipy
-
-Name Strings
-
-    GL_CHROMIUM_flipy
-
-Version
-
-    Last Modifed Date: April 9, 2012
-
-Dependencies
-
-    OpenGL ES 2.0 is required.
-
-Overview
-
-    This extension adds the ability to vertically flip texture image data when
-    calling TexImage2D and TexSubImage2D.
-
-Issues
-
-
-New Tokens
-
-    Accepted by the <param> parameter of PixelStorei:
-
-        UNPACK_FLIP_Y_CHROMIUM              0x9240
-
-Additions to the OpenGL ES 2.0 Specification
-
-    Modifications to Table 3.1 (PixelStore Parameters)
-
-        Add the following entry:
-
-        Parameter Name                   Type      Initial Value  Valid Range
-        ==============                   ====      =============  ===========
-        UNPACK_FLIP_Y_CHROMIUM           boolean   FALSE          {TRUE, FALSE}
-
-    Modifications to 3.6.2 Transfer of Pixel Rectangles, in the Unpacking
-    section:
-
-    Change
-        "If p indicates the location in memory of the first element of the first
-        row, then the first element of the Nth row is indicated by
-                            p + Nk (3.9)"
-    to
-        "If p indicates the location in memory of the first element of the first
-        row, then the first element of the Nth row is indicated by
-                            p + Nk (3.9)
-        if UNPACK_FLIP_Y is FALSE. Otherwise, the first element of the Nth row
-        is indicated by
-                            p - Nk (3.10)
-
-    After the sentence
-
-        "If the number of bits per element is not 1, 2, 4, or 8 times the number
-        of bits in a GL ubyte, then k = nl for all values of a."
-
-    insert:
-
-        "If UNPACK_FLIP_Y_CHROMIUM is FALSE then p is equal to pixels. Otherwise
-        p is pixels + (height - 1)k."
-
-Interactions with GL_EXT_unpack_subimage
-
-    Do not add the sentence "If UNPACK_FLIP_Y_CHROMIUM is FALSE ..." described
-    in this extension. Instead do the following after applying
-    GL_EXT_unpack_subimage:
-
-    Change
-
-         "There is a mechanism for selecting a sub-rectangle of groups
-          from a larger containing rectangle. This mechanism relies on
-          three integer parameters: UNPACK_ROW_LENGTH, UNPACK_SKIP_ROWS,
-          and UNPACK_SKIP_PIXELS. Before obtaining the first group from
-          memory, the pointer supplied to TexImage2D is effectively
-          advanced by (UNPACK_SKIP_PIXELS)n + (UNPACK_SKIP_ROWS)k
-          elements. Then <width> groups are obtained from contiguous
-          elements in memory (without advancing the pointer), after
-          which the pointer is advanced by k elements. <height> sets of
-          <width> groups of values are obtained this way. See figure
-          3.6."
-
-    to
-
-         "There is a mechanism for selecting a sub-rectangle of groups
-          from a larger containing rectangle. This mechanism relies on
-          three integer parameters: UNPACK_ROW_LENGTH, UNPACK_SKIP_ROWS,
-          and UNPACK_SKIP_PIXELS. IF UNPACK_FLIP_Y_CHROMIUM is FALSE then
-          p, the location of the first element of the first
-          group, is pixels + (UNPACK_SKIP_PIXELS)n + (UNPACK_SKIP_ROWS)k.
-          When UNPACK_FLIP_Y_CHROMIUM is TRUE then p is pixels +
-          (UNPACK_SKIP_PIXELS)n + (UNPACK_SKIP_ROWS + height - 1)k. After
-          p is determined <width> groups are obtained from contiguous
-          elements in memory (without advancing the pointer), after which
-          the pointer is advanced by +/-k elements depending on the value
-          of UNPACK_CHROMIUM_FLIP_Y. <height> sets of <width> groups of
-          values are obtained this way. See figure 3.6."
-
-New Procedures and Functions
-
-    None.
-
-Errors
-
-    None.
-
-New State
-
-    None.
-
-Revision History
-
-    7/22/2011    Documented the extension
-    4/09/2012    Added more documentation and described interactions with
-                 GL_EXT_unpack_subimage