Disable from-text stub build for coverage build

Coverage builds depend on `native` properties for API elements, which
are not included in the API signature files and consequently in
from-text stubs. As no robust solution for handling this has been
planned out at the moment, from-text stub build is disabled for
coverage builds.

Per go/android-code-coverage-quickstart , Java code coverage is
enabled by the three environment variables: `EMMA_INSTRUMENT`,
`EMMA_INSTRUMENT_STAIC` and `EMMA_INSTRUMENT_FRAMEWORK`. This change
disables from-text stub build if any of the three variables are set
to true.

Test: go test ./java && m EMMA_INSTRUMENT=true EMMA_INSTRUMENT_FRAMEWORK=true nothing --build-from-text-stub and inspect ninja query to verify that the stub java library module depends on the from-source stub module
Bug: 304271961
Change-Id: Ie485c784145de6c253611e698354c4f9e4a30685
diff --git a/android/config.go b/android/config.go
index 8f72239..00dc86e 100644
--- a/android/config.go
+++ b/android/config.go
@@ -2059,8 +2059,15 @@
 		version)
 }
 
+func (c *config) JavaCoverageEnabled() bool {
+	return c.IsEnvTrue("EMMA_INSTRUMENT") || c.IsEnvTrue("EMMA_INSTRUMENT_STATIC") || c.IsEnvTrue("EMMA_INSTRUMENT_FRAMEWORK")
+}
+
 func (c *config) BuildFromTextStub() bool {
-	return c.buildFromTextStub
+	// TODO: b/302320354 - Remove the coverage build specific logic once the
+	// robust solution for handling native properties in from-text stub build
+	// is implemented.
+	return c.buildFromTextStub && !c.JavaCoverageEnabled()
 }
 
 func (c *config) SetBuildFromTextStub(b bool) {