package/flutter-sdk-bin: add dart arguments for different runtime modes

Now that profile mode is an option for the flutter-engine package, the logic
in package/flutter-sdk-bin/flutter-sdk-bin.mk is no longer sufficient.

The profile/debug/release logic was inspired by:
https://github.com/meta-flutter/meta-flutter/blob/kirkstone/conf/include/

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
[yann.morin.1998@free.fr:
  - make FLUTTER_ENGINE_RUNTIME_MODE_PROFILE win over
    BR2_ENABLE_RUNTIME_DEBUG
  - don't set variables to empty string
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/flutter-sdk-bin/flutter-sdk-bin.mk

@@ -54,14 +54,20 @@ define HOST_FLUTTER_SDK_BIN_INSTALL_CMDS
 	cp -rpdT $(@D)/. $(HOST_FLUTTER_SDK_BIN_SDK)/
 endef
 
-ifeq ($(BR2_ENABLE_RUNTIME_DEBUG),y)
-HOST_FLUTTER_SDK_BIN_SDK_ROOT = \
-	$(HOST_FLUTTER_SDK_BIN_SDK_ENGINE)/common/flutter_patched_sdk
+ifeq ($(FLUTTER_ENGINE_RUNTIME_MODE_PROFILE),y)
+HOST_FLUTTER_SDK_BIN_PROFILE_FLAGS = --track-widget-creation
 HOST_FLUTTER_SDK_BIN_SDK_PRODUCT = false
+HOST_FLUTTER_SDK_BIN_SDK_ROOT = $(HOST_FLUTTER_SDK_BIN_SDK_ENGINE)/common/flutter_patched_sdk
+HOST_FLUTTER_SDK_BIN_SDK_VM_PROFILE = true
+else ifeq ($(BR2_ENABLE_RUNTIME_DEBUG),y)
+HOST_FLUTTER_SDK_BIN_DEBUG_FLAGS = --enable-asserts
+HOST_FLUTTER_SDK_BIN_SDK_PRODUCT = false
+HOST_FLUTTER_SDK_BIN_SDK_ROOT = $(HOST_FLUTTER_SDK_BIN_SDK_ENGINE)/common/flutter_patched_sdk
+HOST_FLUTTER_SDK_BIN_SDK_VM_PROFILE = false
 else
-HOST_FLUTTER_SDK_BIN_SDK_ROOT = \
-	$(HOST_FLUTTER_SDK_BIN_SDK_ENGINE)/common/flutter_patched_sdk_product
 HOST_FLUTTER_SDK_BIN_SDK_PRODUCT = true
+HOST_FLUTTER_SDK_BIN_SDK_ROOT = $(HOST_FLUTTER_SDK_BIN_SDK_ENGINE)/common/flutter_patched_sdk_product
+HOST_FLUTTER_SDK_BIN_SDK_VM_PROFILE = false
 endif
 
 # The Order matters.Taken from:
@@ -73,8 +79,10 @@ HOST_FLUTTER_SDK_BIN_DART_ARGS = \
 	--sdk-root $(HOST_FLUTTER_SDK_BIN_SDK_ROOT) \
 	--target=flutter \
 	--no-print-incremental-dependencies \
-	-Ddart.vm.profile=false \
+	-Ddart.vm.profile=$(HOST_FLUTTER_SDK_BIN_SDK_VM_PROFILE) \
 	-Ddart.vm.product=$(HOST_FLUTTER_SDK_BIN_SDK_PRODUCT) \
+	$(HOST_FLUTTER_SDK_BIN_DEBUG_FLAGS) \
+	$(HOST_FLUTTER_SDK_BIN_PROFILE_FLAGS) \
 	--aot \
 	--tfa \
 	--target-os linux \