Do not flip image when painting from GraphicsSurface
[GraphicsSurface] Remove unneeded transform when painting to Texture Mapper
Fix unsafe memory load/store from the argument encoder/decoder affecting ARM https://bugs.webkit.org/show_bug.cgi?id=125674

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-12-12
Reviewed by Darin Adler.

Depending on the CPU and CPU config, load and store may have to be aligned.
The argument buffer has no particular alignment which can cause problems.

In this case, on ARMv7, strd and ldrd can have alignment restriction on 16 bytes.
The code encoding double and 64 bits integers was causing bugs.

To avoid problems, the encoders/decoders are modified to just use memcpy. The compiler optimizes
it away for the right instructions (clang uses two ldr/str in the case of 64bits values on ARMv7).

* Platform/CoreIPC/ArgumentDecoder.cpp:
(CoreIPC::decodeValueFromBuffer):
(CoreIPC::ArgumentDecoder::decode):
* Platform/CoreIPC/ArgumentEncoder.cpp:
(CoreIPC::copyValueToBuffer):
(CoreIPC::ArgumentEncoder::encode):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160529 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Conflicts:
	Source/WebKit2/ChangeLog
remove obsolete 0.10 code
Fix y-flip video texture support

Added flags to the ::drawTexture method of the TextureMapper, feels
cleaner than dealing with transformation matrix directly, which
doesn't work anyway.
Zero-copy video texture rendering

The EGLImage stored in the GstBuffer is now rendered via a
GraphicsSurface to the CoordinatedGraphicsLayer.
Add flag to select whether the GraphicsSurface should flip the texture
set GraphicsSurface y-flip flag according to EGLImage orientation
[GStreamer] Reuse video texture

Use a single texture in the video player to grab the frames from the
EGLImages and ensure proper destruction of the resources.
Recreate GraphicsSurface when video size changes.