cc: narrow ChromeOS perf workaround to ARM

cc/raster/one_copy_tile_task_worker_pool.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/raster/one_copy_tile_task_worker_pool.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 402 matching lines @@
       gl->BindTexImage2DCHROMIUM(image_target, staging_buffer->image_id);
     }
 
     // Unbind staging texture.
     gl->BindTexture(image_target, 0);
 
     if (resource_provider_->use_sync_query()) {
       if (!staging_buffer->query_id)
         gl->GenQueriesEXT(1, &staging_buffer->query_id);
 
-#if defined(OS_CHROMEOS)
-      // TODO(reveman): This avoids a performance problem on some ChromeOS
-      // devices. This needs to be removed to support native GpuMemoryBuffer
-      // implementations. crbug.com/436314
+#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARM_FAMILY)
+      // TODO(reveman): This avoids a performance problem on ARM ChromeOS
+      // devices. crbug.com/580166
       gl->BeginQueryEXT(GL_COMMANDS_ISSUED_CHROMIUM, staging_buffer->query_id);
 #else
       gl->BeginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM,
                         staging_buffer->query_id);
 #endif
     }
 
     int bytes_per_row =
         (BitsPerPixel(resource->format()) * resource->size().width()) / 8;
     int chunk_size_in_rows =
@@ skipping 16 matching lines @@
       // used for this copy operation.
       bytes_scheduled_since_last_flush_ += rows_to_copy * bytes_per_row;
 
       if (bytes_scheduled_since_last_flush_ >= max_bytes_per_copy_operation_) {
         gl->ShallowFlushCHROMIUM();
         bytes_scheduled_since_last_flush_ = 0;
       }
     }
 
     if (resource_provider_->use_sync_query()) {
-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARM_FAMILY)
       gl->EndQueryEXT(GL_COMMANDS_ISSUED_CHROMIUM);
 #else
       gl->EndQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM);
 #endif
     }
 
     // Barrier to sync worker context output to cc context.
     gl->OrderingBarrierCHROMIUM();
   }
 
@@ skipping 248 matching lines @@
         return;
 
       busy_buffers_.front()->DestroyGLResources(gl);
       RemoveStagingBuffer(busy_buffers_.front().get());
       busy_buffers_.pop_front();
     }
   }
 }
 
 }  // namespace cc