aw: Disable texure size limit for main GrContext

When using SkiaRenderer with WebView Skia does validation of frame
buffer size. max_texture_size_limit_4096 workaround limits the size
to 4096.

This CL disables workaround for compositing GrContext as frame buffer
comes from Android in that case and we don't control its size.

Bug: 1055904
Change-Id: Id7826683495caf1b26dcc8303eceb2ed7a8ff003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072921Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744666}

android_webview/browser/gfx/output_surface_provider_webview.cc

@@ -94,9 +94,19 @@ void OutputSurfaceProviderWebview::InitializeContext() {
           GpuServiceWebView::GetInstance()->gpu_preferences(),
           std::move(feature_info));
     }
+
+    // As most of the GPU resources used for compositing are created on Chrome
+    // side this affects only validation inside Skia. The workaround effectively
+    // clamps max frame buffer size that comes from Android. As we don't control
+    // frame buffer size using this workaround leads to not drawing anything on
+    // screen.
+    // TODO(vasilyt): Remove this once it handles on Skia side.
+    gpu::GpuDriverBugWorkarounds workarounds_for_skia = workarounds;
+    workarounds_for_skia.max_texture_size_limit_4096 = false;
+
     shared_context_state_->InitializeGrContext(
-        GpuServiceWebView::GetInstance()->gpu_preferences(), workarounds,
-        nullptr /* gr_shader_cache */);
+        GpuServiceWebView::GetInstance()->gpu_preferences(),
+        workarounds_for_skia, nullptr /* gr_shader_cache */);
   }
 }