Added FBO Invalidation workaround for Nexus 6.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 0886768193444d6e61c7467c5ef30e28aeaf85a6..96182ea3726d86efc6eac3ceed54e60572101c21 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -4492,6 +4492,10 @@ void GLES2DecoderImpl::DoDisableVertexAttribArray(GLuint index) {
 void GLES2DecoderImpl::DoDiscardFramebufferEXT(GLenum target,
                                                GLsizei numAttachments,
                                                const GLenum* attachments) {
+  if (workarounds().disable_fbo_invalidations) {

[vmiura, 2015/03/25 21:43:11]

nit: no need for {} brackets.

[David Yen, 2015/03/25 21:45:27]

Done.

+    return;
+  }
+
   Framebuffer* framebuffer =
       GetFramebufferInfoForTarget(GL_FRAMEBUFFER);