all: Move jacocoTestReport exclusions to individual projects

The sourceSets.main.output.collect should probably be improved at some point to
improve loading performance, but this is technically better than what we had
before so let's call it a win and move on.

all/build.gradle

@@ -60,15 +60,11 @@ jacocoTestReport {
         html.enabled = true
     }
 
-    additionalSourceDirs.from(files(subprojects.sourceSets.main.allSource.srcDirs))
-    sourceDirectories.from(files(subprojects.sourceSets.main.allSource.srcDirs))
-    classDirectories.from(files(subprojects.sourceSets.main.output).collect {
-        fileTree(dir: it,
-        exclude: [
-                '**/io/grpc/internal/testing/**',
-                '**/io/grpc/okhttp/internal/**',
-        ])
-    })
+    subprojects.each { subproject ->
+        additionalSourceDirs.from(subproject.jacocoTestReport.additionalSourceDirs)
+        sourceDirectories.from(subproject.jacocoTestReport.sourceDirectories)
+        classDirectories.from(subproject.jacocoTestReport.classDirectories)
+    }
 }
 
 coveralls {

okhttp/build.gradle

@@ -36,3 +36,12 @@ checkstyleMain.exclude '**/io/grpc/okhttp/internal/**'
 
 javadoc.exclude 'io/grpc/okhttp/internal/**'
 javadoc.options.links 'http://square.github.io/okhttp/2.x/okhttp/'
+
+jacocoTestReport {
+    classDirectories.from = sourceSets.main.output.collect {
+        fileTree(dir: it,
+        exclude: [
+                '**/io/grpc/okhttp/internal/**',
+        ])
+    }
+}

testing/build.gradle

@@ -33,3 +33,12 @@ dependencies {
 }
 
 javadoc { exclude 'io/grpc/internal/**' }
+
+jacocoTestReport {
+    classDirectories.from = sourceSets.main.output.collect {
+        fileTree(dir: it,
+        exclude: [
+                '**/io/grpc/internal/testing/**',
+        ])
+    }
+}