Assume float and half float formats are renderable on Mac.

From histogram data, they are 100% renderable on all Mac.

Avoid runtime check, where CheckFramebufferStatus() hangs
from time to time.

Also, limit this to AMD/Intel/Nvidia GPUs.

BUG=1127387
TEST=bots
R=kbr@chromium.org

Change-Id: If7567f3410090241c2ab861b93bd45c117051c6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436386Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811863}

gpu/config/gpu_driver_bug_list.json

@@ -3592,6 +3592,42 @@
         "value": "24",
         "value2": "27"
       }
+    },
+    {
+      "id": 355,
+      "cr_bugs": [1127387],
+      "description": "Always assume float formats are renderable on Mac Intel",
+      "os": {
+        "type": "macosx"
+      },
+      "vendor_id": "0x8086",
+      "features": [
+        "force_enable_color_buffer_float"
+      ]
+    },
+    {
+      "id": 356,
+      "cr_bugs": [1127387],
+      "description": "Always assume float formats are renderable on Mac AMD",
+      "os": {
+        "type": "macosx"
+      },
+      "vendor_id": "0x1002",
+      "features": [
+        "force_enable_color_buffer_float"
+      ]
+    },
+    {
+      "id": 357,
+      "cr_bugs": [1127387],
+      "description": "Always assume float formats are renderable on Mac Nvidia",
+      "os": {
+        "type": "macosx"
+      },
+      "vendor_id": "0x10de",
+      "features": [
+        "force_enable_color_buffer_float"
+      ]
     }
   ]
 }

gpu/config/gpu_workaround_list.txt

@@ -68,6 +68,7 @@ exit_on_context_lost
 flush_on_framebuffer_change
 force_cube_complete
 force_cube_map_positive_x_allocation
+force_enable_color_buffer_float
 force_gl_flush_on_swap_buffers
 force_high_performance_gpu
 force_int_or_srgb_cube_texture_complete