Add CMake path to gradle

platform_tools/android/apps/build.gradle

Index: platform_tools/android/apps/build.gradle
diff --git a/platform_tools/android/apps/build.gradle b/platform_tools/android/apps/build.gradle
index 7622cbdca3560c86573144dd83e5640aa778936c..6319a84241df26fa0e301da612733a55aa822757 100644
--- a/platform_tools/android/apps/build.gradle
+++ b/platform_tools/android/apps/build.gradle
@@ -19,12 +19,12 @@ allprojects {
     }
 }
 
-def setupSkiaLibraryBuild(project, appVariants, buildCmd) {
+def setupSkiaLibraryBuild(project, appVariants, buildCmd, requireCMake = false) {
     appVariants.all{ variant ->
         def buildNativeLib = project.task("${variant.name}_SkiaNativeLib", type:Exec) {
             workingDir '../../../..' // top-level skia directory
             commandLine constructBuildCommand(variant, buildCmd).split()
-            environment PATH: getPathWithDepotTools()
+            environment PATH: getPathWithDeps(requireCMake)
             environment ANDROID_SDK_ROOT: getSDKPath()
         }
         buildNativeLib.onlyIf { !project.hasProperty("suppressNativeBuild") }
@@ -63,8 +63,7 @@ def getSDKPath() {
     return path
 }
 
-def getPathWithDepotTools() {
-    System.getenv("PATH") + ":" + getLocalProperties().getProperty('depot_tools.dir', null)
+def getPathWithDeps(requireCMake = false) {
     String path = System.getenv("PATH")
     if (!path.contains("depot_tools")) {
         path += ":" + getLocalProperties().getProperty('depot_tools.dir', null)
@@ -74,6 +73,12 @@ def getPathWithDepotTools() {
         throw GradleScriptException("Depot Tools not found! Please update your path to include" +
                                     " depot_tools or define depot_tools.dir in gradle.properties")
     }
+
+    if (requireCMake && !path.contains("cmake")) {

[djsollen, 2016/04/29 19:30:07]

check that getSDKPath() + "/cmake/bin" exists because we need that particular
version of cmake since it has android specific stuff.

+        path += ":" + getSDKPath() + "/cmake/bin"

[djsollen, 2016/04/29 19:30:07]

prepend this to the path since we need to pick the copy in the SDK over any
other one on their system which won't have the android specific stuff that we
need.

+        // No need to check and throw exception here because getSDKPath() already did that.

[djsollen, 2016/04/29 19:30:07]

we should throw an exception if they don't have the android SDK version of cmake
so they know to install it.

+    }
+
     return path
 }