Rename native code coverage paths product variables in Make.

Rename `CoveragePath` and `CoverageExcludePaths` as
`NativeCoveragePath` and `NativeCoverageExcludePaths` (resp.).
Also, populate `NativeCoveragePath` and `NativeCoverageExcludePaths`
from environment variables `NATIVE_COVERAGE_PATHS` and
`NATIVE_COVERAGE_EXCLUDE_PATHS` (resp.).

Test: m nothing
Bug: 158212027
Change-Id: I409dbb04b09744a7bd95a4b69361e858b9f89e23
diff --git a/core/binary.mk b/core/binary.mk
index 4894bf2..2a31fdd 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -71,8 +71,12 @@
   my_pool := $(GOMA_OR_RBE_POOL)
 endif
 
-ifneq (,$(strip $(foreach dir,$(COVERAGE_PATHS),$(filter $(dir)%,$(LOCAL_PATH)))))
-ifeq (,$(strip $(foreach dir,$(COVERAGE_EXCLUDE_PATHS),$(filter $(dir)%,$(LOCAL_PATH)))))
+# TODO(b/158212027): Remove `$(COVERAGE_PATHS)` from this condition when all users have been moved
+# to `NATIVE_COVERAGE_PATHS`.
+ifneq (,$(strip $(foreach dir,$(COVERAGE_PATHS) $(NATIVE_COVERAGE_PATHS),$(filter $(dir)%,$(LOCAL_PATH)))))
+# TODO(b/158212027): Remove `$(COVERAGE_EXCLUDE_PATHS)` from this condition when all users have been
+# moved to `NATIVE_COVERAGE_EXCLUDE_PATHS`.
+ifeq (,$(strip $(foreach dir,$(COVERAGE_EXCLUDE_PATHS) $(NATIVE_COVERAGE_EXCLUDE_PATHS),$(filter $(dir)%,$(LOCAL_PATH)))))
   my_native_coverage := true
 else
   my_native_coverage := false