Remove rarely used GLConnection stuff in flow. (#3440)

I had added this initially as a means of making it easier to deal with OpenGL directly in Flow. However, we are moving away from dealing with the client rendering APIs directly. Instead, delegating everything to Skia. Besides, we only ever used this to log the GPU description in case of context setup failures. This has not proved to be useful so far. Also, having this in place is making it difficult to remove all dependencies on GL in Shell.

Author: chinmaygarde

flow/BUILD.gn

@@ -61,11 +61,5 @@ source_set("flow") {
       "//apps/mozart/lib/skia",
       "//apps/mozart/services/composition",
     ]
-  } else {
-    sources += [
-      "gl_connection.cc",
-      "gl_connection.h",
-      "open_gl.h",
-    ]
   }
 }

flow/gl_connection.cc

@@ -4,7 +4,6 @@
 
 #include "gpu_surface_gl.h"
 
-#include "flutter/flow/gl_connection.h"
 #include "flutter/glue/trace_event.h"
 #include "lib/ftl/arraysize.h"
 #include "lib/ftl/logging.h"
@@ -50,9 +49,7 @@ bool GPUSurfaceGL::Setup() {
       sk_sp<GrContext>(GrContext::Create(kOpenGL_GrBackend, backend_context));
 
   if (context_ == nullptr) {
-    flow::GLConnection connection;
-    FTL_LOG(INFO) << "Failed to setup GL context. Aborting.";
-    FTL_LOG(INFO) << connection.Description();
+    FTL_LOG(INFO) << "Failed to setup Skia Gr context.";
     return false;
   }
 

flow/gl_connection.h

@@ -14159,15 +14159,12 @@ FILE: ../../../flutter/content_handler/rasterizer.cc
 FILE: ../../../flutter/content_handler/rasterizer.h
 FILE: ../../../flutter/content_handler/runtime_holder.cc
 FILE: ../../../flutter/content_handler/runtime_holder.h
-FILE: ../../../flutter/flow/gl_connection.cc
-FILE: ../../../flutter/flow/gl_connection.h
 FILE: ../../../flutter/flow/layers/backdrop_filter_layer.cc
 FILE: ../../../flutter/flow/layers/backdrop_filter_layer.h
 FILE: ../../../flutter/flow/layers/child_scene_layer.cc
 FILE: ../../../flutter/flow/layers/child_scene_layer.h
 FILE: ../../../flutter/flow/layers/shader_mask_layer.cc
 FILE: ../../../flutter/flow/layers/shader_mask_layer.h
-FILE: ../../../flutter/flow/open_gl.h
 FILE: ../../../flutter/flow/process_info.h
 FILE: ../../../flutter/flow/raster_cache.cc
 FILE: ../../../flutter/flow/raster_cache.h
@@ -72119,4 +72116,4 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 ====================================================================================================
 Total license count: 695
-     31553 of 31553 ██████████ 100% (0 missing licenses)  Done.    
+     31550 of 31550 ██████████ 100% (0 missing licenses)  Done.