Skip GLES2ConformTest.GL2FixedTests_buffer_color_input_run on debug

This test doesn't run fast enough to always finish within the hard-coded 45 second time limit.

R=kbr@chromium.org
TBR=piman@chromium.org

BUG=646442
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2346883002
Cr-Commit-Position: refs/heads/master@{#418996}

gpu/gles2_conform_support/gles2_conform_test_expectations.txt

@@ -28,7 +28,7 @@
 
 517966 WIN OPENGL : GL2FixedTests_blend_input_run = FAIL
 517966 WIN OPENGL : GL2FixedTests_buffer_clear_input_run = FAIL
-517966 WIN OPENGL : GL2FixedTests_buffer_color_input_run = FAIL
+517966 WIN OPENGL RELEASE : GL2FixedTests_buffer_color_input_run = FAIL
 517966 WIN OPENGL : GL2FixedTests_copy_texture_input_run = FAIL
 517966 WIN OPENGL : GL2FixedTests_depth_buffer_clear_input_run = FAIL
 517966 WIN OPENGL : GL2FixedTests_stencil_plane_clear_input_run = FAIL
@@ -77,7 +77,7 @@
 253674 MAC : GL2Tests_three_uniforms_input_run = FAIL
 
 630452 MAC NVIDIA : GL2FixedTests_color_ramp_input_run = SKIP
-630452 MAC NVIDIA : GL2FixedTests_buffer_color_input_run = SKIP
+630452 MAC NVIDIA RELEASE : GL2FixedTests_buffer_color_input_run = SKIP
 
 393677 CHROMEOS INTEL 0xa011 : GL_acos_input_run = FAIL
 393677 CHROMEOS INTEL 0xa011 : GL_asin_input_run = FAIL
@@ -102,6 +102,9 @@
 598902 LINUX OPENGL INTEL : GLCoverage_input_run = FAIL
 598902 LINUX OPENGL INTEL : GL2FixedTests_copy_texture_input_run = FAIL
 
+// Test takes too long to run in debug configurations
+646442 DEBUG : GL2FixedTests_buffer_color_input_run = SKIP
+
 ////////////////////////////////////////////////////////////////////////////////
 //
 //  Temprory entries: they should be removed once the bugs are fixed.